diff --git a/lib/routes/misskey/user-timeline.ts b/lib/routes/misskey/user-timeline.ts
new file mode 100644
index 00000000000000..851ade81841166
--- /dev/null
+++ b/lib/routes/misskey/user-timeline.ts
@@ -0,0 +1,42 @@
+import { Route } from '@/types';
+import utils from './utils';
+import { config } from '@/config';
+import ConfigNotFoundError from '@/errors/types/config-not-found';
+import InvalidParameterError from '@/errors/types/invalid-parameter';
+
+export const route: Route = {
+    path: '/users/notes/:username',
+    categories: ['social-media'],
+    example: '/misskey/users/notes/support@misskey.io',
+    parameters: { username: 'misskey username format, like support@misskey.io' },
+    features: {
+        requireConfig: false,
+        requirePuppeteer: false,
+        antiCrawler: false,
+        supportBT: false,
+        supportPodcast: false,
+        supportScihub: false,
+    },
+    name: 'User timeline',
+    maintainers: ['siygle'],
+    handler,
+};
+
+async function handler(ctx) {
+    const username = ctx.req.param('username');
+    const [, pureUsername, site] = username.match(/@?(\w+)@(\w+\.\w+)/) || [];
+    if (!pureUsername || !site) {
+        throw new InvalidParameterError('Provide a valid Misskey username');
+    }
+    if (!config.feature.allow_user_supply_unsafe_domain && !utils.allowSiteList.includes(site)) {
+        throw new ConfigNotFoundError(`This RSS is disabled unless 'ALLOW_USER_SUPPLY_UNSAFE_DOMAIN' is set to 'true'.`);
+    }
+
+    const { accountData } = await utils.getUserTimelineByUsername(pureUsername, site);
+
+    return {
+        title: `User timeline for ${username} on ${site}`,
+        link: `https://${site}/@${pureUsername}`,
+        item: utils.parseNotes(accountData, site),
+    };
+}
diff --git a/lib/routes/misskey/utils.ts b/lib/routes/misskey/utils.ts
index 4c8bcfdf0f2ba7..5cf2969546957f 100644
--- a/lib/routes/misskey/utils.ts
+++ b/lib/routes/misskey/utils.ts
@@ -4,6 +4,8 @@ const __dirname = getCurrentPath(import.meta.url);
 import { art } from '@/utils/render';
 import { parseDate } from '@/utils/parse-date';
 import path from 'node:path';
+import cache from '@/utils/cache';
+import got from '@/utils/got';
 
 const allowSiteList = ['misskey.io', 'madost.one', 'mk.nixnet.social'];
 
@@ -28,4 +30,42 @@ const parseNotes = (data, site) =>
         };
     });
 
-export default { parseNotes, allowSiteList };
+async function getUserTimelineByUsername(username, site) {
+    const searchUrl = `https://${site}/api/users/search-by-username-and-host`;
+    const cacheUid = `misskey_username/${site}/${username}`;
+
+    const accountId = await cache.tryGet(cacheUid, async () => {
+        const searchResponse = await got({
+            method: 'post',
+            url: searchUrl,
+            json: {
+                username,
+                host: site,
+                detail: true,
+                limit: 1,
+            },
+        });
+        const userData = searchResponse.data.find((item) => item.username === username);
+
+        if (userData.length === 0) {
+            throw new Error(`username ${username} not found`);
+        }
+        return userData.id;
+    });
+
+    const usernotesUrl = `https://${site}/api/users/notes`;
+    const usernotesResponse = await got({
+        method: 'post',
+        url: usernotesUrl,
+        json: {
+            userId: accountId,
+            withChannelNotes: true,
+            limit: 10,
+            offset: 0,
+        },
+    });
+    const accountData = usernotesResponse.data;
+    return { site, accountId, accountData };
+}
+
+export default { parseNotes, getUserTimelineByUsername, allowSiteList };