diff --git a/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommand.cs b/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommand.cs
index 010f5de9bf..7b7d8003a3 100644
--- a/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommand.cs
+++ b/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommand.cs
@@ -154,6 +154,12 @@ public class DeleteManagedOrganizationUserAccountCommand : IDeleteManagedOrganiz
             }
         }
 
+        if (orgUser.Type == OrganizationUserType.Admin && await _currentContext.OrganizationCustom(organizationId))
+        {
+            throw new BadRequestException("Custom users can not delete admins.");
+        }
+
+
         if (!managementStatus.TryGetValue(orgUser.Id, out var isManaged) || !isManaged)
         {
             throw new BadRequestException("Member is not managed by the organization.");
diff --git a/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommand.cs b/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommand.cs
index 9375a231ec..3568a2a2b9 100644
--- a/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommand.cs
+++ b/src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommand.cs
@@ -25,7 +25,8 @@ public class RemoveOrganizationUserCommand : IRemoveOrganizationUserCommand
     public const string UserNotFoundErrorMessage = "User not found.";
     public const string UsersInvalidErrorMessage = "Users invalid.";
     public const string RemoveYourselfErrorMessage = "You cannot remove yourself.";
-    public const string RemoveOwnerByNonOwnerErrorMessage = "Only owners can delete other owners.";
+    public const string RemoveOwnerByNonOwnerErrorMessage = "Only owners can remove other owners.";
+    public const string RemoveAdminByCustomUserErrorMessage = "Custom users can not remove admins.";
     public const string RemoveLastConfirmedOwnerErrorMessage = "Organization must have at least one confirmed owner.";
     public const string RemoveClaimedAccountErrorMessage = "Cannot remove member accounts claimed by the organization. To offboard a member, revoke or delete the account.";
 
@@ -153,6 +154,11 @@ public class RemoveOrganizationUserCommand : IRemoveOrganizationUserCommand
             }
         }
 
+        if (orgUser.Type == OrganizationUserType.Admin && await _currentContext.OrganizationCustom(orgUser.OrganizationId))
+        {
+            throw new BadRequestException(RemoveAdminByCustomUserErrorMessage);
+        }
+
         if (_featureService.IsEnabled(FeatureFlagKeys.AccountDeprovisioning) && deletingUserId.HasValue && eventSystemUser == null)
         {
             var managementStatus = await _getOrganizationUsersManagementStatusQuery.GetUsersOrganizationManagementStatusAsync(orgUser.OrganizationId, new[] { orgUser.Id });
diff --git a/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommandTests.cs b/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommandTests.cs
index b21ae5459f..f8f6bdb60d 100644
--- a/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommandTests.cs
+++ b/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/DeleteManagedOrganizationUserAccountCommandTests.cs
@@ -131,6 +131,38 @@ public class DeleteManagedOrganizationUserAccountCommandTests
             .LogOrganizationUserEventAsync(Arg.Any<OrganizationUser>(), Arg.Any<EventType>(), Arg.Any<DateTime?>());
     }
 
+    [Theory]
+    [BitAutoData]
+    public async Task DeleteUserAsync_WhenCustomUserDeletesAdmin_ThrowsException(
+        SutProvider<DeleteManagedOrganizationUserAccountCommand> sutProvider, User user,
+        [OrganizationUser(OrganizationUserStatusType.Confirmed, OrganizationUserType.Admin)] OrganizationUser organizationUser,
+        Guid deletingUserId)
+    {
+        // Arrange
+        organizationUser.UserId = user.Id;
+
+        sutProvider.GetDependency<IOrganizationUserRepository>()
+            .GetByIdAsync(organizationUser.Id)
+            .Returns(organizationUser);
+
+        sutProvider.GetDependency<IUserRepository>().GetByIdAsync(user.Id)
+            .Returns(user);
+
+        sutProvider.GetDependency<ICurrentContext>()
+            .OrganizationCustom(organizationUser.OrganizationId)
+            .Returns(true);
+
+        // Act
+        var exception = await Assert.ThrowsAsync<BadRequestException>(() =>
+            sutProvider.Sut.DeleteUserAsync(organizationUser.OrganizationId, organizationUser.Id, deletingUserId));
+
+        // Assert
+        Assert.Equal("Custom users can not delete admins.", exception.Message);
+        await sutProvider.GetDependency<IUserService>().Received(0).DeleteAsync(Arg.Any<User>());
+        await sutProvider.GetDependency<IEventService>().Received(0)
+            .LogOrganizationUserEventAsync(Arg.Any<OrganizationUser>(), Arg.Any<EventType>(), Arg.Any<DateTime?>());
+    }
+
     [Theory]
     [BitAutoData]
     public async Task DeleteUserAsync_DeletingOwnerWhenNotOwner_ThrowsException(
diff --git a/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommandTests.cs b/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommandTests.cs
index 6ab8236b8e..a60850c5a9 100644
--- a/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommandTests.cs
+++ b/test/Core.Test/AdminConsole/OrganizationFeatures/OrganizationUsers/RemoveOrganizationUserCommandTests.cs
@@ -171,6 +171,28 @@ public class RemoveOrganizationUserCommandTests
         Assert.Contains(RemoveOrganizationUserCommand.RemoveOwnerByNonOwnerErrorMessage, exception.Message);
     }
 
+    [Theory, BitAutoData]
+    public async Task RemoveUser_WhenCustomUserRemovesAdmin_ThrowsException(
+    [OrganizationUser(type: OrganizationUserType.Admin)] OrganizationUser organizationUser,
+    [OrganizationUser(type: OrganizationUserType.Custom)] OrganizationUser deletingUser,
+    SutProvider<RemoveOrganizationUserCommand> sutProvider)
+    {
+        // Arrange
+        organizationUser.OrganizationId = deletingUser.OrganizationId;
+
+        sutProvider.GetDependency<IOrganizationUserRepository>()
+            .GetByIdAsync(organizationUser.Id)
+            .Returns(organizationUser);
+        sutProvider.GetDependency<ICurrentContext>()
+            .OrganizationCustom(organizationUser.OrganizationId)
+            .Returns(true);
+
+        // Act & Assert
+        var exception = await Assert.ThrowsAsync<BadRequestException>(
+            () => sutProvider.Sut.RemoveUserAsync(organizationUser.OrganizationId, organizationUser.Id, deletingUser.UserId));
+        Assert.Contains(RemoveOrganizationUserCommand.RemoveAdminByCustomUserErrorMessage, exception.Message);
+    }
+
     [Theory, BitAutoData]
     public async Task RemoveUser_WithDeletingUserId_RemovingLastOwner_ThrowsException(
         [OrganizationUser(type: OrganizationUserType.Owner)] OrganizationUser organizationUser,