diff --git a/assets/openapi.json b/assets/openapi.json
index 5de9ed291..f9f6f540b 100644
Binary files a/assets/openapi.json and b/assets/openapi.json differ
diff --git a/src/api/routes/channels/#channel_id/polls/#poll_id/expire.ts b/src/api/routes/channels/#channel_id/polls/#poll_id/expire.ts
new file mode 100644
index 000000000..9ac128861
--- /dev/null
+++ b/src/api/routes/channels/#channel_id/polls/#poll_id/expire.ts
@@ -0,0 +1,49 @@
+/*
+  Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
+  Copyright (C) 2026 Spacebar and Spacebar Contributors
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Affero General Public License as published
+  by the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Affero General Public License for more details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { Request, Response, Router } from "express";
+import { route } from "@spacebar/api/util/handlers/route";
+import { Message } from "#database";
+import { DiscordApiErrors } from "#util";
+
+const router: Router = Router({ mergeParams: true });
+
+router.post("/", route({ permission: "VIEW_CHANNEL" }), async (req: Request, res: Response) => {
+    const { poll_id } = req.params as { [key: string]: string };
+
+    const message = await Message.findOne({ where: { id: poll_id } });
+
+    if (!message) {
+        throw DiscordApiErrors.UNKNOWN_MESSAGE;
+    }
+
+    if (!message.poll) {
+        throw DiscordApiErrors.NON_POLL_MESSAGE_CANNOT_EXPIRE;
+    }
+
+    if (new Date() > new Date(message.poll.expiry)) {
+        throw DiscordApiErrors.POLL_EXPIRED;
+    }
+
+    message.poll.expiry = new Date();
+
+    await message.save();
+    res.send(message);
+});
+
+export default router;
diff --git a/src/util/util/Constants.ts b/src/util/util/Constants.ts
index b605d1a9e..78c738974 100644
--- a/src/util/util/Constants.ts
+++ b/src/util/util/Constants.ts
@@ -663,6 +663,7 @@ export const DiscordApiErrors = {
     POLL_EXPIRED: new ApiError("Poll expired", 520001),
     POLL_INVALID_CHANNEL_TYPE: new ApiError("Invalid channel type for poll creation", 520002),
     POLL_CANNOT_EDIT_MESSAGE: new ApiError("Cannot edit a poll message", 520003),
+    NON_POLL_MESSAGE_CANNOT_EXPIRE: new ApiError("Cannot expire a non-poll message", 520006),
 
     //Other errors
     UNKNOWN_VOICE_STATE: new ApiError("Unknown Voice State", 10065, 404),