diff --git a/fabledscryer/audit/__init__.py b/fabledscryer/audit/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/fabledscryer/audit/routes.py b/fabledscryer/audit/routes.py
new file mode 100644
index 0000000..a10eab4
--- /dev/null
+++ b/fabledscryer/audit/routes.py
@@ -0,0 +1,42 @@
+from __future__ import annotations
+import json
+from quart import Blueprint, render_template, request, current_app
+from sqlalchemy import select
+from fabledscryer.auth.middleware import require_role
+from fabledscryer.models.audit import AuditEvent
+from fabledscryer.models.users import UserRole
+
+audit_bp = Blueprint("audit", __name__, url_prefix="/audit")
+
+
+@audit_bp.get("/")
+@require_role(UserRole.admin)
+async def list_events():
+    limit = min(int(request.args.get("limit", 200)), 500)
+    action_filter = request.args.get("action", "").strip()
+    async with current_app.db_sessionmaker() as db:
+        stmt = select(AuditEvent).order_by(AuditEvent.timestamp.desc()).limit(limit)
+        if action_filter:
+            stmt = select(AuditEvent).where(
+                AuditEvent.action.like(f"{action_filter}%")
+            ).order_by(AuditEvent.timestamp.desc()).limit(limit)
+        result = await db.execute(stmt)
+        events = result.scalars().all()
+
+    # Parse detail_json for display
+    parsed = []
+    for e in events:
+        detail = {}
+        if e.detail_json:
+            try:
+                detail = json.loads(e.detail_json)
+            except (ValueError, TypeError):
+                detail = {"raw": e.detail_json}
+        parsed.append({"event": e, "detail": detail})
+
+    return await render_template(
+        "audit/list.html",
+        events=parsed,
+        limit=limit,
+        action_filter=action_filter,
+    )
diff --git a/fabledscryer/auth/ldap_auth.py b/fabledscryer/auth/ldap_auth.py
new file mode 100644
index 0000000..098229f
--- /dev/null
+++ b/fabledscryer/auth/ldap_auth.py
@@ -0,0 +1,98 @@
+"""fabledscryer/auth/ldap_auth.py
+
+LDAP authentication helper. Requires the optional `ldap3` package.
+Falls back gracefully if ldap3 is not installed.
+"""
+from __future__ import annotations
+import asyncio
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def _ldap_available() -> bool:
+    try:
+        import ldap3  # noqa: F401
+        return True
+    except ImportError:
+        return False
+
+
+def _ldap_authenticate_sync(cfg: dict, username: str, password: str) -> dict | None:
+    """Synchronous LDAP auth. Returns user info dict or None on failure.
+
+    Called via run_in_executor so it doesn't block the event loop.
+    """
+    import ldap3
+
+    host = cfg.get("host", "")
+    port = int(cfg.get("port", 389))
+    use_tls = cfg.get("tls", False)
+    bind_dn = cfg.get("bind_dn", "")
+    bind_password = cfg.get("bind_password", "")
+    base_dn = cfg.get("base_dn", "")
+    user_filter = cfg.get("user_filter", "(uid={username})").format(username=username)
+    admin_group_dn = cfg.get("admin_group_dn", "")
+    operator_group_dn = cfg.get("operator_group_dn", "")
+    attr_username = cfg.get("attr_username", "uid")
+    attr_email = cfg.get("attr_email", "mail")
+
+    tls = ldap3.Tls() if use_tls else None
+    server = ldap3.Server(host, port=port, tls=tls, get_info=ldap3.ALL)
+
+    # Service account bind to search for user DN
+    try:
+        svc_conn = ldap3.Connection(server, user=bind_dn, password=bind_password, auto_bind=True)
+    except Exception as exc:
+        logger.error("LDAP service bind failed: %s", exc)
+        return None
+
+    try:
+        svc_conn.search(
+            search_base=base_dn,
+            search_filter=user_filter,
+            attributes=[attr_username, attr_email, "memberOf", "dn"],
+        )
+        if not svc_conn.entries:
+            logger.debug("LDAP user not found: %s", username)
+            return None
+        entry = svc_conn.entries[0]
+        user_dn = str(entry.entry_dn)
+        ldap_username = str(getattr(entry, attr_username, [username])[0]) if hasattr(entry, attr_username) else username
+        ldap_email = str(getattr(entry, attr_email, [""])[0]) if hasattr(entry, attr_email) else ""
+        member_of: list[str] = [str(g) for g in getattr(entry, "memberOf", [])]
+    except Exception as exc:
+        logger.error("LDAP search failed: %s", exc)
+        return None
+    finally:
+        svc_conn.unbind()
+
+    # Bind as the user to verify password
+    try:
+        user_conn = ldap3.Connection(server, user=user_dn, password=password, auto_bind=True)
+        user_conn.unbind()
+    except Exception:
+        logger.debug("LDAP password verify failed for %s", username)
+        return None
+
+    # Map role from group membership
+    role = "viewer"
+    if admin_group_dn and admin_group_dn in member_of:
+        role = "admin"
+    elif operator_group_dn and operator_group_dn in member_of:
+        role = "operator"
+
+    return {
+        "username": ldap_username,
+        "email": ldap_email,
+        "role": role,
+    }
+
+
+async def ldap_authenticate(cfg: dict, username: str, password: str) -> dict | None:
+    """Async wrapper around synchronous LDAP auth. Returns user info or None."""
+    if not _ldap_available():
+        logger.warning("ldap3 not installed — LDAP auth unavailable")
+        return None
+    loop = asyncio.get_running_loop()
+    return await loop.run_in_executor(None, _ldap_authenticate_sync, cfg, username, password)
diff --git a/fabledscryer/auth/oidc.py b/fabledscryer/auth/oidc.py
new file mode 100644
index 0000000..3cacf4f
--- /dev/null
+++ b/fabledscryer/auth/oidc.py
@@ -0,0 +1,109 @@
+"""fabledscryer/auth/oidc.py
+
+OIDC Authorization Code flow helpers using httpx.
+No extra dependencies — works with any OIDC provider (Authentik, Keycloak, etc.).
+
+JWT signature verification is intentionally skipped for homelab use;
+we trust the HTTPS connection to the discovery-documented token/userinfo endpoints.
+"""
+from __future__ import annotations
+import base64
+import hashlib
+import json
+import logging
+import os
+import time
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+# Module-level cache: {discovery_url: (fetched_at, doc)}
+_discovery_cache: dict[str, tuple[float, dict]] = {}
+_DISCOVERY_TTL = 300  # seconds
+
+
+async def get_discovery(discovery_url: str) -> dict:
+    """Fetch and cache the OIDC provider discovery document."""
+    now = time.monotonic()
+    if discovery_url in _discovery_cache:
+        fetched_at, doc = _discovery_cache[discovery_url]
+        if now - fetched_at < _DISCOVERY_TTL:
+            return doc
+    async with httpx.AsyncClient(timeout=10) as client:
+        resp = await client.get(discovery_url)
+        resp.raise_for_status()
+        doc = resp.json()
+    _discovery_cache[discovery_url] = (now, doc)
+    return doc
+
+
+def build_authorize_url(doc: dict, client_id: str, redirect_uri: str,
+                        scopes: str, state: str, nonce: str) -> str:
+    """Build the IdP authorization redirect URL."""
+    import urllib.parse
+    params = {
+        "response_type": "code",
+        "client_id": client_id,
+        "redirect_uri": redirect_uri,
+        "scope": scopes,
+        "state": state,
+        "nonce": nonce,
+    }
+    return doc["authorization_endpoint"] + "?" + urllib.parse.urlencode(params)
+
+
+async def exchange_code(doc: dict, client_id: str, client_secret: str,
+                        code: str, redirect_uri: str) -> dict:
+    """Exchange authorization code for tokens. Returns token response dict."""
+    async with httpx.AsyncClient(timeout=15) as client:
+        resp = await client.post(
+            doc["token_endpoint"],
+            data={
+                "grant_type": "authorization_code",
+                "code": code,
+                "redirect_uri": redirect_uri,
+                "client_id": client_id,
+                "client_secret": client_secret,
+            },
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
+async def get_userinfo(doc: dict, access_token: str) -> dict:
+    """Fetch user info from the IdP's userinfo endpoint."""
+    async with httpx.AsyncClient(timeout=10) as client:
+        resp = await client.get(
+            doc["userinfo_endpoint"],
+            headers={"Authorization": f"Bearer {access_token}"},
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
+def decode_id_token_payload(id_token: str) -> dict:
+    """Decode ID token payload without verifying signature (homelab only)."""
+    try:
+        parts = id_token.split(".")
+        if len(parts) < 2:
+            return {}
+        payload_b64 = parts[1]
+        # Add padding
+        payload_b64 += "=" * (4 - len(payload_b64) % 4)
+        return json.loads(base64.urlsafe_b64decode(payload_b64))
+    except Exception:
+        return {}
+
+
+def map_role(groups: list[str], admin_group: str, operator_group: str) -> str:
+    """Map IdP groups to a local role string."""
+    if admin_group and admin_group in groups:
+        return "admin"
+    if operator_group and operator_group in groups:
+        return "operator"
+    return "viewer"
+
+
+def generate_state() -> str:
+    return base64.urlsafe_b64encode(os.urandom(24)).decode().rstrip("=")
diff --git a/fabledscryer/auth/routes.py b/fabledscryer/auth/routes.py
index c9eb4c7..ba7d299 100644
--- a/fabledscryer/auth/routes.py
+++ b/fabledscryer/auth/routes.py
@@ -8,6 +8,33 @@ from fabledscryer.models.users import User, UserRole
 auth_bp = Blueprint("auth", __name__)
 
 
+async def _provision_external_user(app, username: str, email: str, role_str: str):
+    """Create or update a user from an external auth provider (OIDC/LDAP).
+
+    External users get a randomised unusable password so local login is blocked.
+    Their role is updated on every login to reflect current IdP group membership.
+    """
+    import secrets
+    from fabledscryer.models.users import UserRole
+    async with app.db_sessionmaker() as db:
+        result = await db.execute(select(User).where(User.username == username))
+        user = result.scalar_one_or_none()
+        new_role = UserRole(role_str)
+        async with db.begin():
+            if user is None:
+                unusable_hash = bcrypt.hashpw(secrets.token_bytes(32), bcrypt.gensalt()).decode()
+                user = User(username=username, email=email or f"{username}@external",
+                            password_hash=unusable_hash, role=new_role)
+                db.add(user)
+            else:
+                if user.role != new_role:
+                    user.role = new_role
+    # Re-fetch committed user
+    async with app.db_sessionmaker() as db:
+        result = await db.execute(select(User).where(User.username == username))
+        return result.scalar_one()
+
+
 async def get_user_count(app) -> int:
     async with app.db_sessionmaker() as db:
         result = await db.execute(select(func.count()).select_from(User))
@@ -25,21 +52,124 @@ async def login():
     from quart import current_app
     if await get_user_count(current_app) == 0:
         return redirect(url_for("auth.setup"))
-    return await render_template("auth/login.html")
+    oidc_cfg = current_app.config.get("OIDC", {})
+    return await render_template("auth/login.html",
+                                 oidc_enabled=oidc_cfg.get("enabled", False))
 
 
 @auth_bp.post("/login")
 async def login_post():
     from quart import current_app
+    from fabledscryer.core.audit import log_audit
     form = await request.form
     username = form.get("username", "").strip()
-    password = form.get("password", "").encode()
+    password_str = form.get("password", "")
+    password = password_str.encode()
+
+    # Try local auth first
     user = await get_user_by_username(current_app, username)
-    if not user or not user.is_active:
-        return await render_template("auth/login.html", error="Invalid credentials"), 400
-    if not bcrypt.checkpw(password, user.password_hash.encode()):
-        return await render_template("auth/login.html", error="Invalid credentials"), 400
+    if user and user.is_active and bcrypt.checkpw(password, user.password_hash.encode()):
+        login_user(user)
+        await log_audit(current_app, user.id, user.username, "auth.login",
+                        detail={"method": "local", "role": user.role.value})
+        return redirect(url_for("dashboard.index"))
+
+    # Try LDAP fallback if enabled
+    ldap_cfg = current_app.config.get("LDAP", {})
+    if ldap_cfg.get("enabled"):
+        from fabledscryer.auth.ldap_auth import ldap_authenticate
+        ldap_info = await ldap_authenticate(ldap_cfg, username, password_str)
+        if ldap_info:
+            user = await _provision_external_user(
+                current_app, ldap_info["username"], ldap_info["email"], ldap_info["role"]
+            )
+            login_user(user)
+            await log_audit(current_app, user.id, user.username, "auth.login",
+                            detail={"method": "ldap", "role": user.role.value})
+            return redirect(url_for("dashboard.index"))
+
+    oidc_cfg = current_app.config.get("OIDC", {})
+    return await render_template(
+        "auth/login.html",
+        error="Invalid credentials",
+        oidc_enabled=oidc_cfg.get("enabled", False),
+    ), 400
+
+
+@auth_bp.get("/login/oidc")
+async def login_oidc():
+    from quart import current_app
+    from fabledscryer.auth.oidc import get_discovery, build_authorize_url, generate_state
+    oidc_cfg = current_app.config.get("OIDC", {})
+    if not oidc_cfg.get("enabled") or not oidc_cfg.get("discovery_url"):
+        return redirect(url_for("auth.login"))
+    try:
+        doc = await get_discovery(oidc_cfg["discovery_url"])
+    except Exception as exc:
+        return await render_template("auth/login.html", error=f"OIDC discovery failed: {exc}",
+                                     oidc_enabled=True), 502
+    state = generate_state()
+    nonce = generate_state()
+    session["oidc_state"] = state
+    session["oidc_nonce"] = nonce
+    redirect_uri = url_for("auth.login_oidc_callback", _external=True)
+    url = build_authorize_url(
+        doc, oidc_cfg["client_id"], redirect_uri,
+        oidc_cfg.get("scopes", "openid profile email"), state, nonce,
+    )
+    return redirect(url)
+
+
+@auth_bp.get("/login/oidc/callback")
+async def login_oidc_callback():
+    from quart import current_app
+    from fabledscryer.auth.oidc import get_discovery, exchange_code, get_userinfo, map_role
+    from fabledscryer.core.audit import log_audit
+
+    oidc_cfg = current_app.config.get("OIDC", {})
+    error = request.args.get("error")
+    if error:
+        desc = request.args.get("error_description", error)
+        return await render_template("auth/login.html", error=f"SSO error: {desc}",
+                                     oidc_enabled=True), 400
+
+    code = request.args.get("code", "")
+    state = request.args.get("state", "")
+    if not code or state != session.pop("oidc_state", None):
+        return await render_template("auth/login.html", error="Invalid SSO state — try again.",
+                                     oidc_enabled=True), 400
+
+    try:
+        doc = await get_discovery(oidc_cfg["discovery_url"])
+        redirect_uri = url_for("auth.login_oidc_callback", _external=True)
+        tokens = await exchange_code(
+            doc, oidc_cfg["client_id"], oidc_cfg["client_secret"], code, redirect_uri
+        )
+        userinfo = await get_userinfo(doc, tokens["access_token"])
+    except Exception as exc:
+        return await render_template("auth/login.html", error=f"SSO login failed: {exc}",
+                                     oidc_enabled=True), 502
+
+    username_claim = oidc_cfg.get("username_claim", "preferred_username")
+    email_claim = oidc_cfg.get("email_claim", "email")
+    groups_claim = oidc_cfg.get("groups_claim", "groups")
+
+    username = userinfo.get(username_claim) or userinfo.get("sub", "")
+    email = userinfo.get(email_claim, "") or f"{username}@oidc"
+    groups = userinfo.get(groups_claim, [])
+    if not isinstance(groups, list):
+        groups = []
+    role = map_role(groups, oidc_cfg.get("admin_group", ""), oidc_cfg.get("operator_group", ""))
+
+    if not username:
+        return await render_template("auth/login.html",
+                                     error="SSO returned no username.",
+                                     oidc_enabled=True), 400
+
+    user = await _provision_external_user(current_app, username, email, role)
     login_user(user)
+    await log_audit(current_app, user.id, user.username, "auth.login",
+                    detail={"method": "oidc", "role": role})
     return redirect(url_for("dashboard.index"))
 
 
@@ -60,6 +190,7 @@ async def setup():
 @auth_bp.post("/setup")
 async def setup_post():
     from quart import current_app
+    from fabledscryer.core.audit import log_audit
     if await get_user_count(current_app) > 0:
         return redirect(url_for("auth.login"))
     form = await request.form
@@ -74,4 +205,6 @@ async def setup_post():
         async with db.begin():
             db.add(user)
     login_user(user)
+    await log_audit(current_app, user.id, user.username, "auth.setup",
+                    detail={"username": username})
     return redirect(url_for("dashboard.index"))
diff --git a/fabledscryer/core/audit.py b/fabledscryer/core/audit.py
new file mode 100644
index 0000000..63ad5e2
--- /dev/null
+++ b/fabledscryer/core/audit.py
@@ -0,0 +1,40 @@
+"""fabledscryer/core/audit.py
+
+Helpers for writing audit log entries. Each call opens its own DB
+session so audit events are committed independently of the calling
+route's transaction (audit is only written after the main action
+succeeds, by calling this after the main `async with db.begin()` block).
+"""
+from __future__ import annotations
+import json
+import logging
+from datetime import datetime, timezone
+
+logger = logging.getLogger(__name__)
+
+
+async def log_audit(
+    app,
+    user_id: str | None,
+    username: str,
+    action: str,
+    entity_type: str | None = None,
+    entity_id: str | None = None,
+    detail: dict | None = None,
+) -> None:
+    """Write one audit event. Never raises — failures are logged and swallowed."""
+    from fabledscryer.models.audit import AuditEvent
+    try:
+        async with app.db_sessionmaker() as db:
+            async with db.begin():
+                db.add(AuditEvent(
+                    user_id=user_id,
+                    username=username or "unknown",
+                    action=action,
+                    entity_type=entity_type,
+                    entity_id=entity_id,
+                    detail_json=json.dumps(detail) if detail else None,
+                    timestamp=datetime.now(timezone.utc),
+                ))
+    except Exception:
+        logger.exception("Failed to write audit event action=%r", action)
diff --git a/fabledscryer/core/settings.py b/fabledscryer/core/settings.py
index 920cbbe..25a954c 100644
--- a/fabledscryer/core/settings.py
+++ b/fabledscryer/core/settings.py
@@ -51,6 +51,35 @@ DEFAULTS: dict[str, Any] = {
     "ping.threshold.good_ms": 50,
     "ping.threshold.warn_ms": 200,
     "plugins.index_url": "https://git.fabledsword.com/bvandeusen/FabledScryer-plugins/raw/branch/main/index.yaml",
+    # OIDC single-sign-on
+    "oidc.enabled": False,
+    "oidc.discovery_url": "",
+    "oidc.client_id": "",
+    "oidc.client_secret": "",
+    "oidc.scopes": "openid profile email",
+    "oidc.username_claim": "preferred_username",
+    "oidc.email_claim": "email",
+    "oidc.groups_claim": "groups",
+    "oidc.admin_group": "",
+    "oidc.operator_group": "",
+    # LDAP authentication
+    "ldap.enabled": False,
+    "ldap.host": "",
+    "ldap.port": 389,
+    "ldap.tls": False,
+    "ldap.bind_dn": "",
+    "ldap.bind_password": "",
+    "ldap.base_dn": "",
+    "ldap.user_filter": "(uid={username})",
+    "ldap.admin_group_dn": "",
+    "ldap.operator_group_dn": "",
+    "ldap.attr_username": "uid",
+    "ldap.attr_email": "mail",
+    # Scheduled reports
+    "reports.enabled": False,
+    "reports.schedule_day": 6,   # 0=Monday … 6=Sunday
+    "reports.schedule_hour": 8,  # UTC hour
+    "reports.last_sent_at": "",
 }
 
 
@@ -123,6 +152,14 @@ def to_ansible_cfg(settings: dict[str, Any]) -> dict:
     return {"sources": settings.get("ansible.sources", [])}
 
 
+def to_oidc_cfg(settings: dict[str, Any]) -> dict:
+    return {k[len("oidc."):]: settings.get(k, DEFAULTS[k]) for k in DEFAULTS if k.startswith("oidc.")}
+
+
+def to_ldap_cfg(settings: dict[str, Any]) -> dict:
+    return {k[len("ldap."):]: settings.get(k, DEFAULTS[k]) for k in DEFAULTS if k.startswith("ldap.")}
+
+
 def to_plugins_cfg(settings: dict[str, Any]) -> dict:
     """Assemble {plugin_name: {...config}} from all plugin.* keys."""
     result = {}
diff --git a/fabledscryer/migrations/versions/0009_widget_variants.py b/fabledscryer/migrations/versions/0009_widget_variants.py
new file mode 100644
index 0000000..286a3e5
--- /dev/null
+++ b/fabledscryer/migrations/versions/0009_widget_variants.py
@@ -0,0 +1,26 @@
+"""Widget variants — add config_json and title to dashboard_widgets
+
+Revision ID: 0009_widget_variants
+Revises: 0008_share_tokens
+Create Date: 2026-03-22
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "0009_widget_variants"
+down_revision: Union[str, None] = "0008_share_tokens"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("dashboard_widgets",
+                  sa.Column("title", sa.String(128), nullable=True))
+    op.add_column("dashboard_widgets",
+                  sa.Column("config_json", sa.Text, nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("dashboard_widgets", "config_json")
+    op.drop_column("dashboard_widgets", "title")
diff --git a/fabledscryer/migrations/versions/0010_maintenance_windows.py b/fabledscryer/migrations/versions/0010_maintenance_windows.py
new file mode 100644
index 0000000..309cd15
--- /dev/null
+++ b/fabledscryer/migrations/versions/0010_maintenance_windows.py
@@ -0,0 +1,32 @@
+"""Maintenance windows for alert suppression
+
+Revision ID: 0010_maintenance_windows
+Revises: 0009_widget_variants
+Create Date: 2026-03-22
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "0010_maintenance_windows"
+down_revision: Union[str, None] = "0009_widget_variants"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "maintenance_windows",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("name", sa.String(128), nullable=False),
+        sa.Column("start_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("end_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("scope_source", sa.String(64), nullable=True),
+        sa.Column("scope_resource", sa.String(255), nullable=True),
+        sa.Column("created_by", sa.String(36), sa.ForeignKey("users.id", ondelete="RESTRICT"), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("maintenance_windows")
diff --git a/fabledscryer/migrations/versions/0011_audit_log.py b/fabledscryer/migrations/versions/0011_audit_log.py
new file mode 100644
index 0000000..c3e3fdb
--- /dev/null
+++ b/fabledscryer/migrations/versions/0011_audit_log.py
@@ -0,0 +1,35 @@
+"""Audit log table
+
+Revision ID: 0011_audit_log
+Revises: 0010_maintenance_windows
+Create Date: 2026-03-22
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "0011_audit_log"
+down_revision: Union[str, None] = "0010_maintenance_windows"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "audit_events",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("timestamp", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("user_id", sa.String(36),
+                  sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
+        sa.Column("username", sa.String(64), nullable=False, server_default="system"),
+        sa.Column("action", sa.String(64), nullable=False),
+        sa.Column("entity_type", sa.String(64), nullable=True),
+        sa.Column("entity_id", sa.String(255), nullable=True),
+        sa.Column("detail_json", sa.Text, nullable=True),
+    )
+    op.create_index("ix_audit_events_timestamp", "audit_events", ["timestamp"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_audit_events_timestamp", "audit_events")
+    op.drop_table("audit_events")
diff --git a/fabledscryer/models/audit.py b/fabledscryer/models/audit.py
new file mode 100644
index 0000000..2d53d50
--- /dev/null
+++ b/fabledscryer/models/audit.py
@@ -0,0 +1,24 @@
+from __future__ import annotations
+import uuid
+from datetime import datetime, timezone
+from sqlalchemy import DateTime, ForeignKey, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+from .base import Base
+
+
+class AuditEvent(Base):
+    __tablename__ = "audit_events"
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    timestamp: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, default=lambda: datetime.now(timezone.utc)
+    )
+    user_id: Mapped[str | None] = mapped_column(
+        String(36), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
+    )
+    # Denormalized so display survives user deletion
+    username: Mapped[str] = mapped_column(String(64), nullable=False, default="system")
+    action: Mapped[str] = mapped_column(String(64), nullable=False)
+    entity_type: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    entity_id: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    detail_json: Mapped[str | None] = mapped_column(Text, nullable=True)
diff --git a/fabledscryer/templates/audit/list.html b/fabledscryer/templates/audit/list.html
new file mode 100644
index 0000000..693b467
--- /dev/null
+++ b/fabledscryer/templates/audit/list.html
@@ -0,0 +1,78 @@
+{% extends "base.html" %}
+{% block title %}Audit Log — Fabled Scryer{% endblock %}
+{% block content %}
+<div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;">
+  <h1 class="page-title" style="margin-bottom:0;">Audit Log</h1>
+  <form method="get" style="display:flex;gap:0.5rem;align-items:center;">
+    <input type="text" name="action" value="{{ action_filter }}"
+           placeholder="Filter by action…"
+           style="width:200px;font-size:0.85rem;">
+    <button type="submit" class="btn btn-ghost btn-sm">Filter</button>
+    {% if action_filter %}
+    <a href="/audit/" class="btn btn-ghost btn-sm">Clear</a>
+    {% endif %}
+  </form>
+</div>
+
+{% if events %}
+<div class="card-flush">
+  <table class="table">
+    <thead>
+      <tr>
+        <th style="min-width:160px;">Time (UTC)</th>
+        <th>User</th>
+        <th>Action</th>
+        <th>Entity</th>
+        <th>Detail</th>
+      </tr>
+    </thead>
+    <tbody>
+      {% for item in events %}
+      {% set e = item.event %}
+      {% set d = item.detail %}
+      <tr>
+        <td style="font-family:ui-monospace,monospace;font-size:0.8rem;white-space:nowrap;color:var(--text-muted);">
+          {{ e.timestamp.strftime("%Y-%m-%d %H:%M:%S") }}
+        </td>
+        <td style="font-size:0.85rem;">{{ e.username }}</td>
+        <td>
+          {% set cat = e.action.split('.')[0] %}
+          <span style="
+            font-size:0.78rem;font-family:ui-monospace,monospace;
+            padding:0.15rem 0.4rem;border-radius:3px;
+            background:{% if cat == 'auth' %}var(--bg-elevated){% elif cat == 'plugin' %}var(--gold-dim){% elif cat == 'alert' %}var(--red-dim){% elif cat == 'host' %}var(--green-dim){% elif cat == 'settings' %}var(--bg-elevated){% else %}var(--bg-elevated){% endif %};
+            color:{% if cat == 'auth' %}var(--accent){% elif cat == 'plugin' %}var(--gold){% elif cat == 'alert' %}var(--red){% elif cat == 'host' %}var(--green){% elif cat == 'settings' %}var(--text-muted){% else %}var(--text-muted){% endif %};">
+            {{ e.action }}
+          </span>
+        </td>
+        <td style="font-size:0.82rem;color:var(--text-muted);">
+          {% if e.entity_type %}
+          <span style="color:var(--text-dim);">{{ e.entity_type }}/</span>{{ e.entity_id or "" }}
+          {% endif %}
+        </td>
+        <td style="font-size:0.8rem;color:var(--text-muted);max-width:340px;">
+          {% if d %}
+          {% for k, v in d.items() %}
+          <span style="color:var(--text-dim);">{{ k }}:</span>
+          <span style="font-family:ui-monospace,monospace;">{{ v }}</span>
+          {% if not loop.last %} &nbsp;·&nbsp; {% endif %}
+          {% endfor %}
+          {% endif %}
+        </td>
+      </tr>
+      {% endfor %}
+    </tbody>
+  </table>
+</div>
+<p style="font-size:0.78rem;color:var(--text-dim);margin-top:0.75rem;">
+  Showing last {{ limit }} events.
+  {% if events | length == limit %}
+  <a href="?limit={{ limit * 2 }}{% if action_filter %}&action={{ action_filter }}{% endif %}">Load more</a>
+  {% endif %}
+</p>
+{% else %}
+<div class="card" style="text-align:center;padding:3rem;">
+  <p style="color:var(--text-muted);">No audit events recorded yet.</p>
+</div>
+{% endif %}
+{% endblock %}
diff --git a/fabledscryer/templates/auth/login.html b/fabledscryer/templates/auth/login.html
index 9c8f9a9..55be0e7 100644
--- a/fabledscryer/templates/auth/login.html
+++ b/fabledscryer/templates/auth/login.html
@@ -4,6 +4,22 @@
 <div style="max-width:400px;margin:4rem auto;">
     <div class="card">
         <h2 class="page-title">Sign In</h2>
+        {% if error %}
+        <div style="color:var(--red);font-size:0.88rem;margin-bottom:1rem;
+                    background:var(--red-dim);padding:0.6rem 0.75rem;border-radius:4px;">
+          {{ error }}
+        </div>
+        {% endif %}
+        {% if oidc_enabled %}
+        <a href="/login/oidc" class="btn" style="width:100%;text-align:center;margin-bottom:1.25rem;display:block;">
+          Sign in with SSO
+        </a>
+        <div style="display:flex;align-items:center;gap:0.75rem;margin-bottom:1.25rem;">
+          <div style="flex:1;height:1px;background:var(--border-mid);"></div>
+          <span style="font-size:0.78rem;color:var(--text-dim);">or</span>
+          <div style="flex:1;height:1px;background:var(--border-mid);"></div>
+        </div>
+        {% endif %}
         <form method="post" action="/login">
             <div class="form-group">
                 <label>Username</label>
@@ -13,7 +29,9 @@
                 <label>Password</label>
                 <input type="password" name="password" required>
             </div>
-            <button type="submit" class="btn">Sign In</button>
+            <button type="submit" class="btn {% if oidc_enabled %}btn-ghost{% endif %}" style="width:100%;">
+              Sign In
+            </button>
         </form>
     </div>
 </div>
diff --git a/fabledscryer/templates/settings/auth.html b/fabledscryer/templates/settings/auth.html
new file mode 100644
index 0000000..a40d7d0
--- /dev/null
+++ b/fabledscryer/templates/settings/auth.html
@@ -0,0 +1,178 @@
+{# fabledscryer/templates/settings/auth.html #}
+{% extends "base.html" %}
+{% block title %}Settings — Auth — Fabled Scryer{% endblock %}
+{% block content %}
+{% set active_tab = "auth" %}
+{% include "settings/_tabs.html" %}
+
+<form method="post" action="/settings/auth/">
+<div style="display:grid;gap:1.25rem;max-width:640px;">
+
+  {# ── OIDC ─────────────────────────────────────────────────────────────────── #}
+  <div class="card">
+    <h2 class="section-title" style="margin-bottom:1.25rem;">OIDC / SSO</h2>
+    <p style="font-size:0.82rem;color:var(--text-muted);margin-bottom:1rem;">
+      Supports any OIDC provider — Authentik, Keycloak, Authelia, etc. Uses Authorization Code flow.
+      Local admin login always works regardless of OIDC status.
+    </p>
+
+    <div class="form-group" style="display:flex;align-items:center;gap:0.75rem;">
+      <input type="checkbox" name="oidc.enabled" id="oidc-enabled"
+             {% if settings['oidc.enabled'] %}checked{% endif %}>
+      <label for="oidc-enabled" style="margin:0;">Enable OIDC login</label>
+    </div>
+
+    <div class="form-group">
+      <label>Discovery URL</label>
+      <input type="text" name="oidc.discovery_url" value="{{ settings['oidc.discovery_url'] }}"
+             placeholder="https://auth.example.com/application/o/fabledscryer/.well-known/openid-configuration">
+      <p style="font-size:0.75rem;color:var(--text-muted);margin-top:0.2rem;">
+        Authentik: <code>https://&lt;host&gt;/application/o/&lt;slug&gt;/.well-known/openid-configuration</code>
+      </p>
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr 1fr;gap:1rem;">
+      <div class="form-group">
+        <label>Client ID</label>
+        <input type="text" name="oidc.client_id" value="{{ settings['oidc.client_id'] }}"
+               autocomplete="off">
+      </div>
+      <div class="form-group">
+        <label>Client Secret <span style="color:var(--text-dim);font-size:0.8rem;">(blank = keep current)</span></label>
+        <input type="password" name="oidc.client_secret" placeholder="••••••••"
+               autocomplete="new-password">
+      </div>
+    </div>
+
+    <div class="form-group">
+      <label>Scopes</label>
+      <input type="text" name="oidc.scopes" value="{{ settings['oidc.scopes'] }}"
+             placeholder="openid profile email">
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr 1fr 1fr;gap:1rem;">
+      <div class="form-group">
+        <label>Username claim</label>
+        <input type="text" name="oidc.username_claim" value="{{ settings['oidc.username_claim'] }}"
+               placeholder="preferred_username">
+      </div>
+      <div class="form-group">
+        <label>Email claim</label>
+        <input type="text" name="oidc.email_claim" value="{{ settings['oidc.email_claim'] }}"
+               placeholder="email">
+      </div>
+      <div class="form-group">
+        <label>Groups claim</label>
+        <input type="text" name="oidc.groups_claim" value="{{ settings['oidc.groups_claim'] }}"
+               placeholder="groups">
+      </div>
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr 1fr;gap:1rem;">
+      <div class="form-group">
+        <label>Admin group name</label>
+        <input type="text" name="oidc.admin_group" value="{{ settings['oidc.admin_group'] }}"
+               placeholder="fabledscryer-admins">
+        <p style="font-size:0.75rem;color:var(--text-muted);margin-top:0.2rem;">Members → admin role</p>
+      </div>
+      <div class="form-group">
+        <label>Operator group name</label>
+        <input type="text" name="oidc.operator_group" value="{{ settings['oidc.operator_group'] }}"
+               placeholder="fabledscryer-operators">
+        <p style="font-size:0.75rem;color:var(--text-muted);margin-top:0.2rem;">Members → operator role; others → viewer</p>
+      </div>
+    </div>
+  </div>
+
+  {# ── LDAP ─────────────────────────────────────────────────────────────────── #}
+  <div class="card">
+    <h2 class="section-title" style="margin-bottom:1.25rem;">LDAP</h2>
+    <p style="font-size:0.82rem;color:var(--text-muted);margin-bottom:1rem;">
+      Binds user credentials against an LDAP/AD directory. Requires the
+      <code>ldap3</code> Python package (<code>pip install ldap3</code>).
+      If both LDAP and OIDC are enabled, the login form tries LDAP; OIDC uses the SSO button.
+    </p>
+
+    <div class="form-group" style="display:flex;align-items:center;gap:0.75rem;">
+      <input type="checkbox" name="ldap.enabled" id="ldap-enabled"
+             {% if settings['ldap.enabled'] %}checked{% endif %}>
+      <label for="ldap-enabled" style="margin:0;">Enable LDAP login</label>
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr auto auto;gap:1rem;align-items:end;">
+      <div class="form-group">
+        <label>LDAP host</label>
+        <input type="text" name="ldap.host" value="{{ settings['ldap.host'] }}"
+               placeholder="ldap.example.com">
+      </div>
+      <div class="form-group">
+        <label>Port</label>
+        <input type="number" name="ldap.port" value="{{ settings['ldap.port'] }}" style="width:80px;">
+      </div>
+      <div class="form-group" style="display:flex;align-items:center;gap:0.5rem;padding-bottom:0.1rem;">
+        <input type="checkbox" name="ldap.tls" id="ldap-tls"
+               {% if settings['ldap.tls'] %}checked{% endif %}>
+        <label for="ldap-tls" style="margin:0;white-space:nowrap;">StartTLS</label>
+      </div>
+    </div>
+
+    <div class="form-group">
+      <label>Service account bind DN</label>
+      <input type="text" name="ldap.bind_dn" value="{{ settings['ldap.bind_dn'] }}"
+             placeholder="cn=svc-fabledscryer,ou=service,dc=example,dc=com">
+    </div>
+    <div class="form-group">
+      <label>Bind password <span style="color:var(--text-dim);font-size:0.8rem;">(blank = keep current)</span></label>
+      <input type="password" name="ldap.bind_password" placeholder="••••••••"
+             autocomplete="new-password">
+    </div>
+    <div class="form-group">
+      <label>Base DN</label>
+      <input type="text" name="ldap.base_dn" value="{{ settings['ldap.base_dn'] }}"
+             placeholder="ou=users,dc=example,dc=com">
+    </div>
+    <div class="form-group">
+      <label>User search filter</label>
+      <input type="text" name="ldap.user_filter" value="{{ settings['ldap.user_filter'] }}"
+             placeholder="(uid={username})">
+      <p style="font-size:0.75rem;color:var(--text-muted);margin-top:0.2rem;">
+        <code>{username}</code> is replaced with the login username. AD example: <code>(sAMAccountName={username})</code>
+      </p>
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr 1fr;gap:1rem;">
+      <div class="form-group">
+        <label>Admin group DN</label>
+        <input type="text" name="ldap.admin_group_dn" value="{{ settings['ldap.admin_group_dn'] }}"
+               placeholder="cn=scryer-admins,ou=groups,dc=example,dc=com">
+      </div>
+      <div class="form-group">
+        <label>Operator group DN</label>
+        <input type="text" name="ldap.operator_group_dn" value="{{ settings['ldap.operator_group_dn'] }}"
+               placeholder="cn=scryer-operators,ou=groups,dc=example,dc=com">
+      </div>
+    </div>
+
+    <div style="display:grid;grid-template-columns:1fr 1fr;gap:1rem;">
+      <div class="form-group">
+        <label>Username attribute</label>
+        <input type="text" name="ldap.attr_username" value="{{ settings['ldap.attr_username'] }}"
+               placeholder="uid">
+      </div>
+      <div class="form-group">
+        <label>Email attribute</label>
+        <input type="text" name="ldap.attr_email" value="{{ settings['ldap.attr_email'] }}"
+               placeholder="mail">
+      </div>
+    </div>
+  </div>
+
+</div>
+<div style="margin-top:1.25rem;">
+  <button type="submit" class="btn">Save</button>
+  <span style="color:var(--text-muted);font-size:0.82rem;margin-left:1rem;">
+    Changes take effect immediately.
+  </span>
+</div>
+</form>
+{% endblock %}
diff --git a/pyproject.toml b/pyproject.toml
index 2d97477..288784a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,12 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
+ldap = [
+    "ldap3>=2.9",
+]
+snmp = [
+    "pysnmp-lextudio>=6.2",
+]
 dev = [
     "pytest>=8.0",
     "pytest-asyncio>=0.23",