diff --git a/packages/stream_chat/CHANGELOG.md b/packages/stream_chat/CHANGELOG.md
index fe83a1966..191e1f51e 100644
--- a/packages/stream_chat/CHANGELOG.md
+++ b/packages/stream_chat/CHANGELOG.md
@@ -1,3 +1,11 @@
+## Upcoming
+
+✅ Added
+
+- Added support for `hideHistoryBefore` in `Channel.addMembers` and `Client.addChannelMembers` to
+  specify a timestamp before which channel history should be hidden for newly added members. When
+  provided, it takes precedence over the `hideHistory` boolean flag.
+
 ## 9.21.0
 
 🐞 Fixed
diff --git a/packages/stream_chat/lib/src/client/channel.dart b/packages/stream_chat/lib/src/client/channel.dart
index d7b85a395..dcbb5b84d 100644
--- a/packages/stream_chat/lib/src/client/channel.dart
+++ b/packages/stream_chat/lib/src/client/channel.dart
@@ -1575,6 +1575,7 @@ class Channel {
     List<String> memberIds, {
     Message? message,
     bool hideHistory = false,
+    DateTime? hideHistoryBefore,
   }) async {
     _checkInitialized();
     return _client.addChannelMembers(
@@ -1583,6 +1584,7 @@ class Channel {
       memberIds,
       message: message,
       hideHistory: hideHistory,
+      hideHistoryBefore: hideHistoryBefore,
     );
   }
 
diff --git a/packages/stream_chat/lib/src/client/client.dart b/packages/stream_chat/lib/src/client/client.dart
index 9f8261bfa..293b7de10 100644
--- a/packages/stream_chat/lib/src/client/client.dart
+++ b/packages/stream_chat/lib/src/client/client.dart
@@ -1266,6 +1266,7 @@ class StreamChatClient {
     List<String> memberIds, {
     Message? message,
     bool hideHistory = false,
+    DateTime? hideHistoryBefore,
   }) =>
       _chatApi.channel.addMembers(
         channelId,
@@ -1273,6 +1274,7 @@ class StreamChatClient {
         memberIds,
         message: message,
         hideHistory: hideHistory,
+        hideHistoryBefore: hideHistoryBefore,
       );
 
   /// Remove members from the channel
diff --git a/packages/stream_chat/lib/src/core/api/channel_api.dart b/packages/stream_chat/lib/src/core/api/channel_api.dart
index f09c764b5..80bb1606f 100644
--- a/packages/stream_chat/lib/src/core/api/channel_api.dart
+++ b/packages/stream_chat/lib/src/core/api/channel_api.dart
@@ -209,13 +209,18 @@ class ChannelApi {
     List<String> memberIds, {
     Message? message,
     bool hideHistory = false,
+    DateTime? hideHistoryBefore,
   }) async {
     final response = await _client.post(
       _getChannelUrl(channelId, channelType),
       data: {
         'add_members': memberIds,
-        'message': message,
-        'hide_history': hideHistory,
+        if (message != null) 'message': message,
+        // [hideHistoryBefore] takes precedence over [hideHistory]
+        ...switch (hideHistoryBefore?.toUtc().toIso8601String()) {
+          final hideBefore? => {'hide_history_before': hideBefore},
+          _ => {'hide_history': hideHistory},
+        },
       },
     );
     return AddMembersResponse.fromJson(response.data);
diff --git a/packages/stream_chat/test/src/client/channel_test.dart b/packages/stream_chat/test/src/client/channel_test.dart
index a22f1195d..55ae1c75a 100644
--- a/packages/stream_chat/test/src/client/channel_test.dart
+++ b/packages/stream_chat/test/src/client/channel_test.dart
@@ -2686,6 +2686,53 @@ void main() {
           message: any(named: 'message'))).called(1);
     });
 
+    test('`.addMembers` with hideHistoryBefore', () async {
+      final members = List.generate(
+        3,
+        (index) => Member(userId: 'test-member-id-$index'),
+      );
+      final memberIds = members
+          .map((it) => it.userId)
+          .whereType<String>()
+          .toList(growable: false);
+      final message = Message(id: 'test-message-id', text: 'Members Added');
+      final hideHistoryBefore = DateTime.parse('2024-01-01T00:00:00Z');
+
+      final channelModel = ChannelModel(cid: channelCid);
+
+      when(() => client.addChannelMembers(
+            channelId,
+            channelType,
+            memberIds,
+            message: message,
+            hideHistoryBefore: hideHistoryBefore,
+          )).thenAnswer(
+        (_) async => AddMembersResponse()
+          ..channel = channelModel
+          ..members = members
+          ..message = message,
+      );
+
+      final res = await channel.addMembers(
+        memberIds,
+        message: message,
+        hideHistoryBefore: hideHistoryBefore,
+      );
+
+      expect(res, isNotNull);
+      expect(res.channel.cid, channelModel.cid);
+      expect(res.members.length, members.length);
+      expect(res.message?.id, message.id);
+
+      verify(() => client.addChannelMembers(
+            channelId,
+            channelType,
+            memberIds,
+            message: message,
+            hideHistoryBefore: hideHistoryBefore,
+          )).called(1);
+    });
+
     test('`.inviteMembers`', () async {
       final members = List.generate(
         3,
diff --git a/packages/stream_chat/test/src/client/client_test.dart b/packages/stream_chat/test/src/client/client_test.dart
index 8ecf73823..4d750dde4 100644
--- a/packages/stream_chat/test/src/client/client_test.dart
+++ b/packages/stream_chat/test/src/client/client_test.dart
@@ -1915,6 +1915,50 @@ void main() {
       verifyNoMoreInteractions(api.channel);
     });
 
+    test('`.addChannelMembers` with hideHistoryBefore', () async {
+      const channelType = 'test-channel-type';
+      const channelId = 'test-channel-id';
+      const channelCid = '$channelType:$channelId';
+
+      final members = List.generate(
+        3,
+        (index) => Member(userId: 'test-user-id-$index'),
+      );
+
+      final memberIds = members.map((e) => e.userId!).toList(growable: false);
+      final hideHistoryBefore = DateTime.parse('2024-01-01T00:00:00Z');
+
+      when(() => api.channel.addMembers(
+            channelId,
+            channelType,
+            memberIds,
+            hideHistoryBefore: hideHistoryBefore,
+          )).thenAnswer((_) async => AddMembersResponse()
+        ..channel = ChannelModel(cid: channelCid)
+        ..members = members);
+
+      final res = await client.addChannelMembers(
+        channelId,
+        channelType,
+        memberIds,
+        hideHistoryBefore: hideHistoryBefore,
+      );
+
+      expect(res, isNotNull);
+      expect(res.channel.cid, channelCid);
+      expect(res.members.length, memberIds.length);
+
+      verify(
+        () => api.channel.addMembers(
+          channelId,
+          channelType,
+          memberIds,
+          hideHistoryBefore: hideHistoryBefore,
+        ),
+      ).called(1);
+      verifyNoMoreInteractions(api.channel);
+    });
+
     test('`.removeChannelMembers`', () async {
       const channelType = 'test-channel-type';
       const channelId = 'test-channel-id';
diff --git a/packages/stream_chat/test/src/core/api/channel_api_test.dart b/packages/stream_chat/test/src/core/api/channel_api_test.dart
index 2f05c98ab..7c12a3d3b 100644
--- a/packages/stream_chat/test/src/core/api/channel_api_test.dart
+++ b/packages/stream_chat/test/src/core/api/channel_api_test.dart
@@ -409,6 +409,85 @@ void main() {
     verifyNoMoreInteractions(client);
   });
 
+  test('addMembers with hideHistoryBefore', () async {
+    const channelId = 'test-channel-id';
+    const channelType = 'test-channel-type';
+    const memberIds = ['test-member-id-1', 'test-member-id-2'];
+    final channelModel = ChannelModel(id: channelId, type: channelType);
+    final message = Message(id: 'test-message-id', text: 'members-added');
+    final hideHistoryBefore = DateTime.parse('2024-01-01T00:00:00Z');
+
+    final path = _getChannelUrl(channelId, channelType);
+
+    when(() => client.post(
+          path,
+          data: {
+            'add_members': memberIds,
+            'message': message,
+            'hide_history_before': hideHistoryBefore.toUtc().toIso8601String(),
+          },
+        )).thenAnswer((_) async => successResponse(path, data: {
+          'channel': channelModel.toJson(),
+          'message': message.toJson(),
+        }));
+
+    final res = await channelApi.addMembers(
+      channelId,
+      channelType,
+      memberIds,
+      message: message,
+      hideHistoryBefore: hideHistoryBefore,
+    );
+
+    expect(res, isNotNull);
+    expect(res.channel.cid, channelModel.cid);
+    expect(res.message?.id, message.id);
+
+    verify(() => client.post(path, data: any(named: 'data'))).called(1);
+    verifyNoMoreInteractions(client);
+  });
+
+  test('addMembers with hideHistoryBefore takes precedence over hideHistory',
+      () async {
+    const channelId = 'test-channel-id';
+    const channelType = 'test-channel-type';
+    const memberIds = ['test-member-id-1', 'test-member-id-2'];
+    final channelModel = ChannelModel(id: channelId, type: channelType);
+    final message = Message(id: 'test-message-id', text: 'members-added');
+    const hideHistory = true;
+    final hideHistoryBefore = DateTime.parse('2024-01-01T00:00:00Z');
+
+    final path = _getChannelUrl(channelId, channelType);
+
+    when(() => client.post(
+          path,
+          data: {
+            'add_members': memberIds,
+            'message': message,
+            'hide_history_before': hideHistoryBefore.toUtc().toIso8601String(),
+          },
+        )).thenAnswer((_) async => successResponse(path, data: {
+          'channel': channelModel.toJson(),
+          'message': message.toJson(),
+        }));
+
+    final res = await channelApi.addMembers(
+      channelId,
+      channelType,
+      memberIds,
+      message: message,
+      hideHistory: hideHistory,
+      hideHistoryBefore: hideHistoryBefore,
+    );
+
+    expect(res, isNotNull);
+    expect(res.channel.cid, channelModel.cid);
+    expect(res.message?.id, message.id);
+
+    verify(() => client.post(path, data: any(named: 'data'))).called(1);
+    verifyNoMoreInteractions(client);
+  });
+
   test('removeMembers', () async {
     const channelId = 'test-channel-id';
     const channelType = 'test-channel-type';