diff --git a/ecosystem.config.cjs b/ecosystem.config.cjs
index b0f7579c..12b4f4d8 100644
--- a/ecosystem.config.cjs
+++ b/ecosystem.config.cjs
@@ -92,6 +92,14 @@ module.exports = {
       args: 'run src/servers/sidecar/invoiceshelf/index.ts',
       watch: false,
     },
+    // Notes. Wraps a self-hosted Memos. The instance URL and its personal access token are set by the
+    // owner from the UI and stored in `service_connections` — read here, never from the environment.
+    {
+      name: 'officer-memos',
+      script: 'bun',
+      args: 'run src/servers/sidecar/memos/index.ts',
+      watch: false,
+    },
     // Calendar and contacts. Supervises Radicale (CalDAV/CardDAV) on a loopback port and owns the
     // collections under DATA_PATH/dav. Two doors: /dav for phones (DAVx5, iOS, Thunderbird — HTTP Basic
     // against a scoped app password) and /api/caldav for Officer's own UI. The protocol is Radicale's;
diff --git a/src/databases/officer_db/src/queries/service-connections.ts b/src/databases/officer_db/src/queries/service-connections.ts
index ce277760..f9e7a74a 100644
--- a/src/databases/officer_db/src/queries/service-connections.ts
+++ b/src/databases/officer_db/src/queries/service-connections.ts
@@ -13,7 +13,7 @@ import { encryptSecret, decryptSecret } from '../crypto';
 // moment someone forgot to strip it.
 
 /** The services that keep a connection here. Extending it is a one-line change, not a migration. */
-export type ServiceName = 'transmission' | 'slskd' | 'esplora' | 'nbxplorer';
+export type ServiceName = 'transmission' | 'slskd' | 'esplora' | 'nbxplorer' | 'memos' | 'opengist';
 
 export type ServiceConnection = {
   id: number;
diff --git a/src/servers/api/memos/router.ts b/src/servers/api/memos/router.ts
new file mode 100644
index 00000000..c4d7726e
--- /dev/null
+++ b/src/servers/api/memos/router.ts
@@ -0,0 +1,16 @@
+import { createSidecarProxy } from '../../sidecar/create-proxy';
+
+// /api/memos/* — auth, then forward to officer-memos. No routes of its own and no Memos knowledge:
+// this file must never grow app logic.
+//
+// The sidecar owns the Memos contract and holds the personal access token. The platform knows neither.
+
+const proxy = createSidecarProxy({
+  name: 'memos',
+  prefix: '/api/memos',
+});
+
+export const memosRouter = proxy.router;
+
+/** Base URL of the sidecar's HTTP server, or null if it hasn't reported in yet. */
+export const getMemosServerUrl = proxy.getHttpUrl;
diff --git a/src/servers/hono.ts b/src/servers/hono.ts
index 3a6f3767..b1347930 100644
--- a/src/servers/hono.ts
+++ b/src/servers/hono.ts
@@ -31,6 +31,7 @@ import { walletRouter } from './api/wallet/router';
 import { vpnRouter } from './api/vpn/router';
 import { terminalRouter } from './api/terminal/sidecar-server';
 import { caldavRouter } from './api/dav/sidecar-server';
+import { memosRouter } from './api/memos/router';
 import { davSyncRouter } from './api/dav/sync-router';
 import { davRouter } from './api/dav/router';
 import { notifyRouter } from './api/notify/router';
@@ -123,6 +124,7 @@ protectedRouter.route('/file-browser', fileBrowserRouter);
 protectedRouter.route('/music', musicRouter);
 protectedRouter.route('/slskd', slskdRouter);
 protectedRouter.route('/terminal', terminalRouter);
+protectedRouter.route('/memos', memosRouter);
 protectedRouter.route('/caldav', caldavRouter); // the JSON door for Officer's own calendar/contacts UI
 protectedRouter.route('/dav', davRouter); // app-password management (the sync door is /dav, top-level)
 protectedRouter.route('/notify', notifyRouter);
diff --git a/src/servers/sidecar/memos/index.ts b/src/servers/sidecar/memos/index.ts
new file mode 100644
index 00000000..2f5f357d
--- /dev/null
+++ b/src/servers/sidecar/memos/index.ts
@@ -0,0 +1,189 @@
+import type { SidecarCommand, SidecarEvent } from '../protocol';
+import { createSidecarConnector } from '../connect';
+import { getServiceConnection, saveServiceConnection, deleteServiceConnection, recordServiceProbe } from 'officerdb';
+import { callMemos, getMemosConfig, invalidateMemosConfig, normalizeBase, probe } from './upstream';
+
+// The officer-memos sidecar. Owns the whole Memos contract: the instance URL and the personal access
+// token. The platform side is a thin auth-gated forwarder holding no Memos credentials.
+//
+// ─────────────────────────────────────────────────────────────────────────────────────────────────
+// HTTP CONTRACT — the platform strips its /api/memos mount prefix before forwarding.
+//
+//   GET    /_health          is the instance up, and does the stored token work
+//   GET    /_config          the connection MINUS the token
+//   POST   /_config          { url, token } — validated live before it is stored
+//   DELETE /_config          forget the connection
+//   ANY    /_api/*           forwarded to the instance's own /api/*, token attached
+//
+// `/_api/*` is a deliberate pass-through rather than a hand-written wrapper per endpoint. Memos' REST
+// API is generated from its protobufs and moves between minor versions; re-describing it here would
+// mean a second thing to keep in sync, and the UI is going to speak the upstream's shapes anyway.
+// The allow-list below is the one piece of policy: it keeps the sidecar from being a general-purpose
+// SSRF hop into whatever else is on that host.
+// ─────────────────────────────────────────────────────────────────────────────────────────────────
+
+const API_URL = process.env.API_URL ?? `ws://127.0.0.1:${process.env.PORT ?? '5000'}`;
+
+// Everything under /api/v1 the UI legitimately needs. Auth routes are excluded on purpose: signin and
+// signout would mint or destroy sessions on the instance, and this sidecar authenticates with a stored
+// token rather than borrowing the owner's Memos session.
+const ALLOWED = [/^\/api\/v1\/memos(\/|$|\?)/, /^\/api\/v1\/users(\/|$|\?)/, /^\/api\/v1\/resources(\/|$|\?)/];
+
+function getFreePort(): number {
+  const probeServer = Bun.serve({ port: 0, hostname: '127.0.0.1', fetch: () => new Response('') });
+  const p = probeServer.port;
+  probeServer.stop(true);
+  if (p == null) throw new Error('failed to acquire a free port');
+  return p;
+}
+
+const port = getFreePort();
+const bad = (error: string, status = 400) => Response.json({ error }, { status });
+
+async function handleConfig(req: Request, userId: number): Promise<Response> {
+  if (req.method === 'GET') {
+    const connection = await getServiceConnection(userId, 'memos');
+    return Response.json({ configured: !!connection, connection });
+  }
+
+  if (req.method === 'DELETE') {
+    const removed = await deleteServiceConnection(userId, 'memos');
+    invalidateMemosConfig(userId);
+    return Response.json({ ok: removed });
+  }
+
+  if (req.method === 'POST') {
+    const body = ((await req.json().catch(() => null)) as { url?: unknown; token?: unknown } | null) ?? {};
+    const url = typeof body.url === 'string' ? normalizeBase(body.url) : '';
+    // A blank token on a save means "keep the stored one", so the URL can be corrected without the
+    // token being re-pasted. There is no way to read it back out to re-send it.
+    const token = typeof body.token === 'string' && body.token.trim() ? body.token.trim() : null;
+
+    if (!url) return bad('url is required');
+    if (!/^https?:\/\//i.test(url)) return bad('url must start with http:// or https://');
+
+    const existing = await getServiceConnection(userId, 'memos');
+    if (!token && !existing?.hasSecret) return bad('an access token is required the first time');
+
+    // Probe with the credentials as they WILL be, so a save either stores something that works or
+    // fails with the reason. Storing first and discovering later makes every downstream screen fail
+    // mysteriously instead.
+    const current = token ? null : await getMemosConfig(userId);
+    const result = await probe({ id: existing?.id ?? 0, base: url, token: token ?? current?.token ?? null });
+    if (!result.ok) return bad(result.error ?? 'could not reach the instance');
+
+    await saveServiceConnection({
+      userId,
+      service: 'memos',
+      url,
+      secret: token ?? undefined,
+      version: result.version,
+    });
+    invalidateMemosConfig(userId);
+    return Response.json({ ok: true, user: result.user });
+  }
+
+  return bad('method not allowed', 405);
+}
+
+const server = Bun.serve({
+  port,
+  hostname: '127.0.0.1',
+  // Memos resources are image/file attachments on a note.
+  maxRequestBodySize: 64 * 1024 * 1024,
+  async fetch(req) {
+    const url = new URL(req.url);
+
+    const officerUser = req.headers.get('X-Officer-User');
+    const userId = Number(officerUser);
+    if (!officerUser || !Number.isInteger(userId) || userId <= 0) {
+      return Response.json({ error: 'missing or invalid X-Officer-User' }, { status: 401 });
+    }
+
+    try {
+      if (url.pathname === '/_config') return await handleConfig(req, userId);
+
+      const config = await getMemosConfig(userId);
+
+      if (url.pathname === '/_health') {
+        if (!config) return Response.json({ ok: false, configured: false, error: 'not connected' }, { status: 503 });
+        const started = Date.now();
+        const result = await probe(config);
+        const ms = Date.now() - started;
+        if (!result.ok) {
+          return Response.json({ ok: false, configured: true, error: result.error, ms }, { status: 502 });
+        }
+        await recordServiceProbe(userId, 'memos', result.version);
+        return Response.json({ ok: true, configured: true, user: result.user, ms });
+      }
+
+      if (url.pathname.startsWith('/_api/')) {
+        if (!config) return Response.json({ error: 'memos not connected', configured: false }, { status: 503 });
+        const subpath = url.pathname.slice('/_api'.length) + url.search;
+        if (!ALLOWED.some((re) => re.test(subpath))) return bad('path not allowed', 403);
+
+        const hasBody = req.method !== 'GET' && req.method !== 'HEAD';
+        const upstream = await callMemos(config, subpath, {
+          method: req.method,
+          headers: req.headers.get('content-type') ? { 'content-type': req.headers.get('content-type')! } : {},
+          body: hasBody ? await req.arrayBuffer() : undefined,
+        });
+        return new Response(upstream.body, {
+          status: upstream.status,
+          headers: { 'content-type': upstream.headers.get('content-type') ?? 'application/json' },
+        });
+      }
+    } catch (err) {
+      // Path only. A memo body is the owner's private note.
+      console.error(`[memos] ${req.method} ${url.pathname} failed`, String(err));
+      return Response.json({ error: 'internal error' }, { status: 500 });
+    }
+
+    return Response.json({ error: 'not found' }, { status: 404 });
+  },
+});
+
+console.log(`[memos] listening on 127.0.0.1:${port} (instance configured from the UI, stored in service_connections)`);
+
+type ReplyFn = (msg: SidecarEvent) => void;
+
+function handleCommand(cmd: SidecarCommand, reply: ReplyFn) {
+  switch (cmd.type) {
+    case 'ping':
+      reply({ type: 'pong', id: cmd.id });
+      break;
+    default:
+      reply({
+        type: 'error',
+        id: (cmd as SidecarCommand).id,
+        error: `Unknown command type: ${(cmd as Record<string, unknown>).type}`,
+      });
+  }
+}
+
+const connection = createSidecarConnector({
+  apiUrl: `${API_URL}/api/sidecar/register`,
+  name: 'memos',
+  capabilities: ['memos'],
+  onCommand(cmd, reply) {
+    handleCommand(cmd as SidecarCommand, reply as ReplyFn);
+  },
+  onConnected() {
+    connection.send({ type: 'memos:server', port });
+    console.log(`[memos] reported server port ${port} to API`);
+  },
+});
+
+function shutdown(signal: string) {
+  console.log(`[memos] ${signal} received, shutting down...`);
+  try {
+    server.stop(true);
+  } catch {
+    /* already stopped */
+  }
+  connection.destroy();
+  process.exit(0);
+}
+
+process.on('SIGTERM', () => shutdown('SIGTERM'));
+process.on('SIGINT', () => shutdown('SIGINT'));
diff --git a/src/servers/sidecar/memos/upstream.ts b/src/servers/sidecar/memos/upstream.ts
new file mode 100644
index 00000000..b67a61a4
--- /dev/null
+++ b/src/servers/sidecar/memos/upstream.ts
@@ -0,0 +1,70 @@
+import { getServiceCredentials } from 'officerdb';
+
+// Where the Memos instance is and what it takes to talk to it. The credential lives here and only here —
+// the platform forwards to this sidecar and holds nothing.
+//
+// Memos authenticates with a personal access token (`Authorization: Bearer …`), minted from Memos' own
+// Settings → Access Tokens. That is the OWNER'S to create and paste in; there is no way to derive one
+// from a platform session, and no reason to want one.
+
+export type MemosConfig = { id: number; base: string; token: string | null };
+
+/** Trailing slash stripped, so `${base}/api/v1/...` never doubles the separator. */
+export const normalizeBase = (url: string): string => url.trim().replace(/\/+$/, '');
+
+const cache = new Map<number, MemosConfig | null>();
+
+export function invalidateMemosConfig(userId: number): void {
+  cache.delete(userId);
+}
+
+export async function getMemosConfig(userId: number): Promise<MemosConfig | null> {
+  if (cache.has(userId)) return cache.get(userId) ?? null;
+  const row = await getServiceCredentials(userId, 'memos');
+  const config = row ? { id: row.id, base: normalizeBase(row.url), token: row.secret } : null;
+  cache.set(userId, config);
+  return config;
+}
+
+export const authHeaders = (config: MemosConfig): Record<string, string> =>
+  config.token ? { Authorization: `Bearer ${config.token}` } : {};
+
+/**
+ * One call against the instance. Returns the raw Response so callers can stream or inspect status —
+ * nothing here parses a memo, because a memo is the owner's note and this layer has no business
+ * reading it.
+ */
+export async function callMemos(config: MemosConfig, path: string, init?: RequestInit): Promise<Response> {
+  const headers = { ...authHeaders(config), ...((init?.headers as Record<string, string>) ?? {}) };
+  return fetch(`${config.base}${path}`, { ...init, headers, signal: init?.signal ?? AbortSignal.timeout(20_000) });
+}
+
+export type ProbeResult = { ok: boolean; version: string | null; user: string | null; error?: string };
+
+/**
+ * Is the instance up, and does the stored token actually work?
+ *
+ * Two checks, because they fail differently and the UI needs to tell them apart: `/healthz` answers
+ * unauthenticated so a bad URL is distinguishable from a bad token, and `/api/v1/users/me` is the
+ * cheapest endpoint that genuinely requires auth. Memos returns 200 with an empty list for
+ * unauthenticated reads rather than 401, so "the list came back" proves nothing on its own.
+ */
+export async function probe(config: MemosConfig): Promise<ProbeResult> {
+  try {
+    const health = await fetch(`${config.base}/healthz`, { signal: AbortSignal.timeout(8000) });
+    if (!health.ok) return { ok: false, version: null, user: null, error: `instance returned ${health.status}` };
+  } catch (err) {
+    return { ok: false, version: null, user: null, error: `unreachable: ${String(err)}` };
+  }
+
+  if (!config.token) return { ok: false, version: null, user: null, error: 'no access token stored' };
+
+  try {
+    const me = await callMemos(config, '/api/v1/users/me');
+    if (!me.ok) return { ok: false, version: null, user: null, error: `token rejected (${me.status})` };
+    const body = (await me.json().catch(() => ({}))) as { name?: string; username?: string; nickname?: string };
+    return { ok: true, version: null, user: body.nickname || body.username || body.name || null };
+  } catch (err) {
+    return { ok: false, version: null, user: null, error: String(err) };
+  }
+}
diff --git a/src/servers/sidecar/protocol.ts b/src/servers/sidecar/protocol.ts
index 271e1bdb..6412b626 100644
--- a/src/servers/sidecar/protocol.ts
+++ b/src/servers/sidecar/protocol.ts
@@ -73,6 +73,8 @@ export type SidecarEvent =
   | { type: 'invoiceshelf:server'; port: number }
   // Photos (Immich) — the sidecar reports where its HTTP server is listening (random port) on connect
   | { type: 'photos:server'; port: number }
+  // Memos — the sidecar reports where its HTTP server is listening (random port) on connect
+  | { type: 'memos:server'; port: number }
   // CalDAV/CardDAV — the sidecar reports where its HTTP server is listening (random port) on connect.
   // One port serves both doors: /dav (forwarded to Radicale) and /_officer (JSON for Officer's UI).
   | { type: 'caldav:server'; port: number }