diff --git a/src/Umbraco.Infrastructure/Cache/MemberRepositoryUsernameCachePolicy.cs b/src/Umbraco.Infrastructure/Cache/MemberRepositoryUsernameCachePolicy.cs
index 1dc5f42a01..807c3d2d2c 100644
--- a/src/Umbraco.Infrastructure/Cache/MemberRepositoryUsernameCachePolicy.cs
+++ b/src/Umbraco.Infrastructure/Cache/MemberRepositoryUsernameCachePolicy.cs
@@ -30,4 +30,10 @@ public class MemberRepositoryUsernameCachePolicy : DefaultRepositoryCachePolicy<
 
         return entity;
     }
+
+    public void DeleteByUserName(string key, string? username)
+    {
+        var cacheKey = GetEntityCacheKey(key + username);
+        Cache.ClearByKey(cacheKey);
+    }
 }
diff --git a/src/Umbraco.Infrastructure/Persistence/Repositories/Implement/MemberRepository.cs b/src/Umbraco.Infrastructure/Persistence/Repositories/Implement/MemberRepository.cs
index 053cb15b2d..0815595c06 100644
--- a/src/Umbraco.Infrastructure/Persistence/Repositories/Implement/MemberRepository.cs
+++ b/src/Umbraco.Infrastructure/Persistence/Repositories/Implement/MemberRepository.cs
@@ -38,6 +38,7 @@ public class MemberRepository : ContentRepositoryBase<int, IMember, MemberReposi
     private readonly ITagRepository _tagRepository;
     private bool _passwordConfigInitialized;
     private string? _passwordConfigJson;
+    private const string UsernameCacheKey = "uRepo_userNameKey+";
 
     public MemberRepository(
         IScopeAccessor scopeAccessor,
@@ -228,7 +229,7 @@ public class MemberRepository : ContentRepositoryBase<int, IMember, MemberReposi
     }
 
     public IMember? GetByUsername(string? username) =>
-        _memberByUsernameCachePolicy.GetByUserName("uRepo_userNameKey+", username, PerformGetByUsername, PerformGetAllByUsername);
+        _memberByUsernameCachePolicy.GetByUserName(UsernameCacheKey, username, PerformGetByUsername, PerformGetAllByUsername);
 
     public int[] GetMemberIds(string[] usernames)
     {
@@ -508,6 +509,12 @@ public class MemberRepository : ContentRepositoryBase<int, IMember, MemberReposi
         return sql;
     }
 
+    protected override void PersistDeletedItem(IMember entity)
+    {
+        _memberByUsernameCachePolicy.DeleteByUserName(UsernameCacheKey, entity.Username);
+        base.PersistDeletedItem(entity);
+    }
+
     // TODO: move that one up to Versionable! or better: kill it!
     protected override Sql<ISqlContext> GetBaseQuery(bool isCount) =>
         GetBaseQuery(isCount ? QueryType.Count : QueryType.Single);
@@ -837,6 +844,8 @@ public class MemberRepository : ContentRepositoryBase<int, IMember, MemberReposi
 
         OnUowRefreshedEntity(new MemberRefreshNotification(entity, new EventMessages()));
 
+        _memberByUsernameCachePolicy.DeleteByUserName(UsernameCacheKey, entity.Username);
+
         entity.ResetDirtyProperties();
     }