diff --git a/lib/shared/farcaster/farcaster-hooks.js b/lib/shared/farcaster/farcaster-hooks.js
--- a/lib/shared/farcaster/farcaster-hooks.js
+++ b/lib/shared/farcaster/farcaster-hooks.js
@@ -28,10 +28,14 @@
 import { convertFarcasterMessageToCommMessages } from '../../utils/convert-farcaster-message-to-comm-messages.js';
 import { createFarcasterRawThreadInfo } from '../../utils/create-farcaster-raw-thread-info.js';
 import { useSetFarcasterDCsLoaded } from '../../utils/farcaster-utils.js';
-import { useDispatch } from '../../utils/redux-utils.js';
+import { values } from '../../utils/objects.js';
+import { useDispatch, useSelector } from '../../utils/redux-utils.js';
 import sleep from '../../utils/sleep.js';
 import { useSendDMOperationUtils } from '../dm-ops/dm-op-utils.js';
-import { userIDFromFID } from '../id-utils.js';
+import {
+  conversationIDFromFarcasterThreadID,
+  userIDFromFID,
+} from '../id-utils.js';
 
 const FARCASTER_DATA_BATCH_SIZE = 20;
 const MAX_RETRIES = 3;
@@ -368,6 +372,8 @@
   const fetchConversation = useFetchConversationWithBatching();
   const fetchMessagesForConversation = useFetchMessagesForConversation();
 
+  const threadInfos = useSelector(state => state.threadStore.threadInfos);
+
   const fetchInboxes: (cursor: ?string) => Promise<void> = React.useCallback(
     async (cursor: ?string) => {
       try {
@@ -402,6 +408,34 @@
     [fetchFarcasterInbox],
   );
 
+  const removeDeadThreads = React.useCallback(() => {
+    const conversationsSet = new Set(conversations);
+    const time = Date.now();
+
+    const updateInfos = values(threadInfos)
+      .filter(
+        threadInfo =>
+          threadInfo.farcaster &&
+          !conversationsSet.has(
+            conversationIDFromFarcasterThreadID(threadInfo.id),
+          ),
+      )
+      .map(threadInfo => ({
+        type: updateTypes.DELETE_THREAD,
+        id: uuid.v4(),
+        time,
+        threadID: threadInfo.id,
+      }));
+
+    dispatch({
+      type: processFarcasterOpsActionType,
+      payload: {
+        rawMessageInfos: [],
+        updateInfos,
+      },
+    });
+  }, [conversations, dispatch, threadInfos]);
+
   const [inProgress, setInProgress] = React.useState(false);
   const setFarcasterDCsLoaded = useSetFarcasterDCsLoaded();
   React.useEffect(() => {
@@ -410,6 +444,8 @@
     }
     setInProgress(true);
 
+    removeDeadThreads();
+
     void (async () => {
       const farcasterConversations: Array<FarcasterConversation> = [];
 
@@ -451,6 +487,8 @@
     sendFarcasterTextMessage,
     utils,
     setFarcasterDCsLoaded,
+    threadInfos,
+    removeDeadThreads,
   ]);
 
   return React.useCallback(