diff --git a/src/components/dms/ConvoMenu.tsx b/src/components/dms/ConvoMenu.tsx
index 0a1d3f01cc..92315da466 100644
--- a/src/components/dms/ConvoMenu.tsx
+++ b/src/components/dms/ConvoMenu.tsx
@@ -12,6 +12,10 @@ import {
 } from '#/state/queries/messages/conversation'
 import {useLeaveConvo} from '#/state/queries/messages/leave-conversation'
 import {useMuteConvo} from '#/state/queries/messages/mute-conversation'
+import {
+  useAwaitedProfileBlockMutation,
+  useAwaitedProfileUnblockMutation,
+} from '#/state/queries/profile'
 import * as Toast from '#/view/com/util/Toast'
 import {atoms as a, useTheme} from '#/alf'
 import {ArrowBoxLeft_Stroke2_Corner0_Rounded as ArrowBoxLeft} from '#/components/icons/ArrowBoxLeft'
@@ -34,10 +38,11 @@ let ConvoMenu = ({
   showMarkAsRead,
   hideTrigger,
   triggerOpacity,
+  onUpdateConvo,
 }: {
   convo: ChatBskyConvoDefs.ConvoView
   profile: AppBskyActorDefs.ProfileViewBasic
-  onUpdateConvo?: (convo: ChatBskyConvoDefs.ConvoView) => void
+  onUpdateConvo?: () => void
   control?: Menu.MenuControlProps
   currentScreen: 'list' | 'conversation'
   showMarkAsRead?: boolean
@@ -64,12 +69,41 @@ let ConvoMenu = ({
       } else {
         Toast.show(_(msg`Chat unmuted`))
       }
+      onUpdateConvo?.()
     },
     onError: () => {
       Toast.show(_(msg`Could not mute chat`))
     },
   })
 
+  const {mutateAsync: blockProfile, isPending: isBlockPending} =
+    useAwaitedProfileBlockMutation()
+  const {mutateAsync: unblockProfile, isPending: isUnblockPending} =
+    useAwaitedProfileUnblockMutation()
+  const isBlockMutationPending = isBlockPending || isUnblockPending
+  const isBlocking = Boolean(profile.viewer?.blocking)
+
+  const toggleBlock = useCallback(async () => {
+    if (isBlockMutationPending) return
+
+    if (profile.viewer?.blocking) {
+      await unblockProfile({
+        subject: profile.did,
+        blockUri: profile.viewer?.blocking,
+      })
+    } else {
+      await blockProfile({subject: profile.did})
+    }
+
+    onUpdateConvo?.()
+  }, [
+    profile,
+    isBlockMutationPending,
+    blockProfile,
+    unblockProfile,
+    onUpdateConvo,
+  ])
+
   const {mutate: leaveConvo} = useLeaveConvo(convo?.id, {
     onSuccess: () => {
       if (currentScreen === 'conversation') {
@@ -146,18 +180,17 @@ let ConvoMenu = ({
             </Menu.Item>
           </Menu.Group>
           <Menu.Divider />
-          {/* TODO(samuel): implement this */}
           <Menu.Group>
             <Menu.Item
-              label={_(msg`Block account`)}
-              onPress={() => {}}
-              disabled>
+              disabled={isBlockMutationPending}
+              label={
+                isBlocking ? _(msg`Unblock account`) : _(msg`Block account`)
+              }
+              onPress={toggleBlock}>
               <Menu.ItemText>
-                <Trans>Block account</Trans>
+                {isBlocking ? _(msg`Unblock account`) : _(msg`Block account`)}
               </Menu.ItemText>
-              <Menu.ItemIcon
-                icon={profile.viewer?.blocking ? PersonCheck : PersonX}
-              />
+              <Menu.ItemIcon icon={isBlocking ? PersonX : PersonCheck} />
             </Menu.Item>
             <Menu.Item
               label={_(msg`Report conversation`)}
diff --git a/src/screens/Messages/Conversation/index.tsx b/src/screens/Messages/Conversation/index.tsx
index f382647a5b..7b46564428 100644
--- a/src/screens/Messages/Conversation/index.tsx
+++ b/src/screens/Messages/Conversation/index.tsx
@@ -98,6 +98,7 @@ function Inner() {
    * Any other convo states (atm) are "ready" states
    */
 
+  console.log(convoState.blocks)
   return (
     <KeyboardProvider>
       <KeyboardAvoidingView
@@ -242,6 +243,7 @@ let Header = ({
           convo={convoState.convo}
           profile={profile}
           currentScreen="conversation"
+          onUpdateConvo={convoState.revalidateConvo}
         />
       ) : (
         <View style={{width: 30}} />
diff --git a/src/screens/Messages/List/ChatListItem.tsx b/src/screens/Messages/List/ChatListItem.tsx
index 57a8e03480..080593d755 100644
--- a/src/screens/Messages/List/ChatListItem.tsx
+++ b/src/screens/Messages/List/ChatListItem.tsx
@@ -4,9 +4,11 @@ import {ChatBskyConvoDefs} from '@atproto/api'
 import {msg} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 import {useNavigation} from '@react-navigation/native'
+import {useQueryClient} from '@tanstack/react-query'
 
 import {NavigationProp} from '#/lib/routes/types'
 import {isNative} from '#/platform/detection'
+import {RQKEY as ListConvosQueryKey} from '#/state/queries/messages/list-converations'
 import {useSession} from '#/state/session'
 import {TimeElapsed} from '#/view/com/util/TimeElapsed'
 import {UserAvatar} from '#/view/com/util/UserAvatar'
@@ -36,6 +38,7 @@ export function ChatListItem({
   const displayName = isDeletedAccount
     ? 'Deleted Account'
     : otherUser?.displayName || otherUser?.handle
+  const queryClient = useQueryClient()
 
   let lastMessage = _(msg`No messages yet`)
   let lastMessageSentAt: string | null = null
@@ -73,6 +76,10 @@ export function ChatListItem({
     })
   }, [convo.id, navigation])
 
+  const onUpdateConvo = React.useCallback(() => {
+    queryClient.invalidateQueries({queryKey: ListConvosQueryKey})
+  }, [queryClient])
+
   if (!otherUser) {
     return null
   }
@@ -204,6 +211,7 @@ export function ChatListItem({
                 triggerOpacity={
                   !gtMobile || showActions || menuControl.isOpen ? 1 : 0
                 }
+                onUpdateConvo={onUpdateConvo}
               />
             </View>
           </View>
diff --git a/src/state/queries/profile.ts b/src/state/queries/profile.ts
index 3e25359166..de62a7eee0 100644
--- a/src/state/queries/profile.ts
+++ b/src/state/queries/profile.ts
@@ -384,6 +384,9 @@ function useProfileUnmuteMutation() {
 
 export function useProfileBlockMutationQueue(
   profile: Shadow<AppBskyActorDefs.ProfileViewDetailed>,
+  options?: {
+    onSuccess?: () => void
+  },
 ) {
   const queryClient = useQueryClient()
   const did = profile.did
@@ -414,6 +417,7 @@ export function useProfileBlockMutationQueue(
       updateProfileShadow(queryClient, did, {
         blockingUri: finalBlockingUri,
       })
+      options?.onSuccess?.()
     },
   })
 
@@ -478,6 +482,60 @@ function useProfileUnblockMutation() {
   })
 }
 
+export function useAwaitedProfileBlockMutation() {
+  const {currentAccount} = useSession()
+  const {getAgent} = useAgent()
+  const queryClient = useQueryClient()
+
+  return useMutation({
+    mutationFn: async ({subject}: {subject: string}) => {
+      if (!currentAccount) {
+        throw new Error('Not signed in')
+      }
+      await getAgent().app.bsky.graph.block.create(
+        {repo: currentAccount.did},
+        {subject: subject, createdAt: new Date().toISOString()},
+      )
+      await whenAppViewReady(
+        getAgent,
+        subject,
+        res => !!res.data.viewer?.blocking,
+      )
+    },
+    onSuccess(_, {subject}) {
+      queryClient.invalidateQueries({queryKey: RQKEY_MY_BLOCKED()})
+      resetProfilePostsQueries(queryClient, subject, 1000)
+    },
+  })
+}
+
+export function useAwaitedProfileUnblockMutation() {
+  const {currentAccount} = useSession()
+  const {getAgent} = useAgent()
+  const queryClient = useQueryClient()
+
+  return useMutation<void, Error, {subject: string; blockUri: string}>({
+    mutationFn: async ({blockUri, subject}) => {
+      if (!currentAccount) {
+        throw new Error('Not signed in')
+      }
+      const {rkey} = new AtUri(blockUri)
+      await getAgent().app.bsky.graph.block.delete({
+        repo: currentAccount.did,
+        rkey,
+      })
+      await whenAppViewReady(
+        getAgent,
+        subject,
+        res => !res.data.viewer?.blocking,
+      )
+    },
+    onSuccess(_, {subject}) {
+      resetProfilePostsQueries(queryClient, subject, 1000)
+    },
+  })
+}
+
 export function precacheProfile(
   queryClient: QueryClient,
   profile: AppBskyActorDefs.ProfileViewBasic,