diff --git a/lib/Listener/UserDeletedListener.php b/lib/Listener/UserDeletedListener.php
index 17a589f4c5f..229616ecb74 100644
--- a/lib/Listener/UserDeletedListener.php
+++ b/lib/Listener/UserDeletedListener.php
@@ -24,15 +24,19 @@
 namespace OCA\Talk\Listener;
 
 use OCA\Talk\Manager;
+use OCA\Talk\Model\Attendee;
+use OCA\Talk\Service\PollService;
 use OCP\EventDispatcher\Event;
 use OCP\EventDispatcher\IEventListener;
 use OCP\User\Events\UserDeletedEvent;
 
 class UserDeletedListener implements IEventListener {
 	private Manager $manager;
+	private PollService $pollService;
 
-	public function __construct(Manager $manager) {
+	public function __construct(Manager $manager, PollService $pollService) {
 		$this->manager = $manager;
+		$this->pollService = $pollService;
 	}
 
 	public function handle(Event $event): void {
@@ -43,5 +47,7 @@ public function handle(Event $event): void {
 
 		$user = $event->getUser();
 		$this->manager->removeUserFromAllRooms($user);
+
+		$this->pollService->neutralizeDeletedUser(Attendee::ACTOR_USERS, $user->getUID());
 	}
 }
diff --git a/lib/Service/PollService.php b/lib/Service/PollService.php
index 78cdb87fc80..10f6cdda186 100644
--- a/lib/Service/PollService.php
+++ b/lib/Service/PollService.php
@@ -333,4 +333,24 @@ public function updateDisplayNameForActor(string $actorType, string $actorId, st
 			->andWhere($update->expr()->eq('actor_id', $update->createNamedParameter($actorId)));
 		$update->executeStatement();
 	}
+
+	public function neutralizeDeletedUser(string $actorType, string $actorId): void {
+		$update = $this->connection->getQueryBuilder();
+		$update->update('talk_polls')
+			->set('display_name', $update->createNamedParameter(''))
+			->set('actor_type', $update->createNamedParameter('deleted_users'))
+			->set('actor_id', $update->createNamedParameter('deleted_users'))
+			->where($update->expr()->eq('actor_type', $update->createNamedParameter($actorType)))
+			->andWhere($update->expr()->eq('actor_id', $update->createNamedParameter($actorId)));
+		$update->executeStatement();
+
+		$update = $this->connection->getQueryBuilder();
+		$update->update('talk_poll_votes')
+			->set('display_name', $update->createNamedParameter(''))
+			->set('actor_type', $update->createNamedParameter('deleted_users'))
+			->set('actor_id', $update->createNamedParameter('deleted_users'))
+			->where($update->expr()->eq('actor_type', $update->createNamedParameter($actorType)))
+			->andWhere($update->expr()->eq('actor_id', $update->createNamedParameter($actorId)));
+		$update->executeStatement();
+	}
 }
diff --git a/src/components/AvatarWrapper/AvatarWrapperSmall.vue b/src/components/AvatarWrapper/AvatarWrapperSmall.vue
index 952450dd8e1..9c88832ad24 100644
--- a/src/components/AvatarWrapper/AvatarWrapperSmall.vue
+++ b/src/components/AvatarWrapper/AvatarWrapperSmall.vue
@@ -28,6 +28,11 @@
 		<div v-if="iconClass"
 			class="icon"
 			:class="[`avatar-${sizeToString}px`, iconClass]" />
+		<div v-else-if="isDeletedUser"
+			class="guest"
+			:class="`avatar-${sizeToString}px`">
+			X
+		</div>
 		<NcAvatar v-else-if="!isGuest"
 			:user="id"
 			:display-name="name"
@@ -98,7 +103,7 @@ export default {
 	computed: {
 		// Determines which icon is displayed
 		iconClass() {
-			if (!this.source || this.source === 'users' || this.isGuest) {
+			if (!this.source || this.source === 'users' || this.isGuest || this.isDeletedUser) {
 				return ''
 			}
 			if (this.source === 'emails') {
@@ -110,6 +115,9 @@ export default {
 		isGuest() {
 			return this.source === 'guests'
 		},
+		isDeletedUser() {
+			return this.source === 'deleted_users'
+		},
 		firstLetterOfGuestName() {
 			const customName = this.name !== t('spreed', 'Guest') ? this.name : '?'
 			return customName.charAt(0)
diff --git a/src/components/MessagesList/MessagesGroup/Message/MessagePart/PollVotersDetails.vue b/src/components/MessagesList/MessagesGroup/Message/MessagePart/PollVotersDetails.vue
index 0c30c076b81..865a1df919f 100644
--- a/src/components/MessagesList/MessagesGroup/Message/MessagePart/PollVotersDetails.vue
+++ b/src/components/MessagesList/MessagesGroup/Message/MessagePart/PollVotersDetails.vue
@@ -80,6 +80,10 @@ export default {
 				return t('spreed', 'Guest')
 			}
 
+			if (item.actorType === 'deleted_users') {
+				return t('spreed', 'Deleted user')
+			}
+
 			return item.actorDisplayName
 		},
 	},
diff --git a/tests/integration/features/chat/poll.feature b/tests/integration/features/chat/poll.feature
index d7acc1692a5..ab77b2194c3 100644
--- a/tests/integration/features/chat/poll.feature
+++ b/tests/integration/features/chat/poll.feature
@@ -589,3 +589,56 @@ Feature: chat/poll
       | options    | ["Empty question is not","allowed either"] |
       | resultMode | public |
       | maxVotes   | unlimited |
+
+  Scenario: Deleting a user neutralizes their details
+    Given user "participant1" creates room "room" (v4)
+      | roomType | 2 |
+      | roomName | room |
+    And user "participant1" adds user "participant2" to room "room" with 200 (v4)
+    And user "participant2" creates a poll in room "room" with 201
+      | question   | What is the question? |
+      | options    | ["Where are you?","How much is the fish?"] |
+      | resultMode | public |
+      | maxVotes   | unlimited |
+    And user "participant2" votes for options "[0]" on poll "What is the question?" in room "room" with 200
+      | id         | POLL_ID(What is the question?) |
+      | question   | What is the question? |
+      | options    | ["Where are you?","How much is the fish?"] |
+      | votes      | {"option-0":1} |
+      | numVoters  | 1 |
+      | resultMode | public |
+      | maxVotes   | unlimited |
+      | actorType  | users |
+      | actorId    | participant2 |
+      | actorDisplayName    | participant2-displayname |
+      | status     | open |
+      | votedSelf  | [0] |
+    And user "participant2" closes poll "What is the question?" in room "room" with 200
+      | id         | POLL_ID(What is the question?) |
+      | question   | What is the question? |
+      | options    | ["Where are you?","How much is the fish?"] |
+      | votes      | {"option-0":1}   |
+      | numVoters  | 1 |
+      | resultMode | public |
+      | maxVotes   | unlimited |
+      | actorType  | users |
+      | actorId    | participant2 |
+      | actorDisplayName    | participant2-displayname |
+      | status     | closed |
+      | votedSelf  | [0] |
+      | details    | [{"actorType":"users","actorId":"participant2","actorDisplayName":"participant2-displayname","optionId":0}] |
+    When user "participant2" is deleted
+    Then user "participant1" sees poll "What is the question?" in room "room" with 200
+      | id         | POLL_ID(What is the question?) |
+      | question   | What is the question? |
+      | options    | ["Where are you?","How much is the fish?"] |
+      | votes      | {"option-0":1}   |
+      | numVoters  | 1 |
+      | resultMode | public |
+      | maxVotes   | unlimited |
+      | actorType  | deleted_users |
+      | actorId    | deleted_users |
+      | actorDisplayName    | |
+      | status     | closed |
+      | votedSelf  | [] |
+      | details    | [{"actorType":"deleted_users","actorId":"deleted_users","actorDisplayName":"","optionId":0}] |
diff --git a/tests/integration/features/reaction/react.feature b/tests/integration/features/reaction/react.feature
index ebd6ef06344..31fbca93a83 100644
--- a/tests/integration/features/reaction/react.feature
+++ b/tests/integration/features/reaction/react.feature
@@ -164,3 +164,25 @@ Feature: reaction/react
     And user "participant1" sees the following messages in room "room" with 200
       | room | actorType | actorId      | actorDisplayName         | message                | messageParameters                                                               | reactions |
       | room | users     | participant1 | participant1-displayname | Message deleted by you | {"actor":{"type":"user","id":"participant1","name":"participant1-displayname"}} | []        |
+
+  Scenario: Deleting a user neutralizes their details
+    Given user "participant1" creates room "room" (v4)
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds user "participant2" to room "room" with 200 (v4)
+    And user "participant1" sends message "Message 1" to room "room" with 201
+    And user "participant2" react with "👍" on message "Message 1" to room "room" with 201
+      | actorType | actorId      | actorDisplayName         | reaction |
+      | users     | participant2 | participant2-displayname | 👍       |
+    And user "participant2" react with "👎" on message "Message 1" to room "room" with 201
+      | actorType | actorId      | actorDisplayName         | reaction |
+      | users     | participant2 | participant2-displayname | 👎       |
+      | users     | participant2 | participant2-displayname | 👍       |
+    When user "participant2" is deleted
+    And user "participant1" retrieve reactions "👎" of message "Message 1" in room "room" with 200
+      | actorType     | actorId       | actorDisplayName | reaction |
+      | deleted_users | deleted_users |                  | 👎       |
+    And user "participant1" retrieve reactions "all" of message "Message 1" in room "room" with 200
+      | actorType     | actorId       | actorDisplayName | reaction |
+      | deleted_users | deleted_users |                  | 👎       |
+      | deleted_users | deleted_users |                  | 👍       |