diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IOrganizationUnitRepository.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IOrganizationUnitRepository.cs
index a9a92e9e43..b1c1df1676 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IOrganizationUnitRepository.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IOrganizationUnitRepository.cs
@@ -110,6 +110,7 @@ public interface IOrganizationUnitRepository : IBasicRepository<OrganizationUnit
     Task<int> GetMembersCountAsync(
         OrganizationUnit organizationUnit,
         string filter = null,
+        bool includeChildren = false,
         CancellationToken cancellationToken = default
     );
 
diff --git a/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/EfCoreOrganizationUnitRepository.cs b/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/EfCoreOrganizationUnitRepository.cs
index 03649b3c73..1af35eafcc 100644
--- a/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/EfCoreOrganizationUnitRepository.cs
+++ b/modules/identity/src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EntityFrameworkCore/EfCoreOrganizationUnitRepository.cs
@@ -231,9 +231,10 @@ public class EfCoreOrganizationUnitRepository
     public virtual async Task<int> GetMembersCountAsync(
         OrganizationUnit organizationUnit,
         string filter = null,
+        bool includeChildren = false,
         CancellationToken cancellationToken = default)
     {
-        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter);
+        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter, includeChildren);
 
         return await query.CountAsync(GetCancellationToken(cancellationToken));
     }
@@ -324,14 +325,33 @@ public class EfCoreOrganizationUnitRepository
         dbContext.Set<IdentityUserOrganizationUnit>().RemoveRange(ouMembersQuery);
     }
 
-    protected virtual async Task<IQueryable<IdentityUser>> CreateGetMembersFilteredQueryAsync(OrganizationUnit organizationUnit, string filter = null)
+    protected virtual async Task<IQueryable<IdentityUser>> CreateGetMembersFilteredQueryAsync(
+        OrganizationUnit organizationUnit,
+        string filter = null,
+        bool includeChildren = false)
     {
         var dbContext = await GetDbContextAsync();
 
-        var query = from userOu in dbContext.Set<IdentityUserOrganizationUnit>()
-                    join user in dbContext.Users on userOu.UserId equals user.Id
-                    where userOu.OrganizationUnitId == organizationUnit.Id
-                    select user;
+        IQueryable<IdentityUser> query;
+        if (includeChildren)
+        {
+            var childrenIds = await (await GetDbSetAsync())
+                .Where(ou => ou.Code.StartsWith(organizationUnit.Code))
+                .Select(x => x.Id)
+                .ToListAsync();
+
+            query = from userOu in dbContext.Set<IdentityUserOrganizationUnit>()
+                join user in dbContext.Users on userOu.UserId equals user.Id
+                where childrenIds.Contains(userOu.OrganizationUnitId)
+                select user;
+        }
+        else
+        {
+            query = from userOu in dbContext.Set<IdentityUserOrganizationUnit>()
+                join user in dbContext.Users on userOu.UserId equals user.Id
+                where userOu.OrganizationUnitId == organizationUnit.Id
+                select user;
+        }
 
         if (!filter.IsNullOrWhiteSpace())
         {
diff --git a/modules/identity/src/Volo.Abp.Identity.MongoDB/Volo/Abp/Identity/MongoDB/MongoOrganizationUnitRepository.cs b/modules/identity/src/Volo.Abp.Identity.MongoDB/Volo/Abp/Identity/MongoDB/MongoOrganizationUnitRepository.cs
index 78838c9c6c..5515015438 100644
--- a/modules/identity/src/Volo.Abp.Identity.MongoDB/Volo/Abp/Identity/MongoDB/MongoOrganizationUnitRepository.cs
+++ b/modules/identity/src/Volo.Abp.Identity.MongoDB/Volo/Abp/Identity/MongoDB/MongoOrganizationUnitRepository.cs
@@ -193,7 +193,7 @@ public class MongoOrganizationUnitRepository
         CancellationToken cancellationToken = default)
     {
         cancellationToken = GetCancellationToken(cancellationToken);
-        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter, cancellationToken);
+        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter, false, cancellationToken);
         return await query
             .OrderBy(sorting.IsNullOrEmpty() ? nameof(IdentityUser.UserName) : sorting)
             .As<IMongoQueryable<IdentityUser>>()
@@ -212,10 +212,11 @@ public class MongoOrganizationUnitRepository
     public virtual async Task<int> GetMembersCountAsync(
         OrganizationUnit organizationUnit,
         string filter = null,
+        bool includeChildren = false,
         CancellationToken cancellationToken = default)
     {
         cancellationToken = GetCancellationToken(cancellationToken);
-        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter, cancellationToken);
+        var query = await CreateGetMembersFilteredQueryAsync(organizationUnit, filter, includeChildren, cancellationToken);
         return await query.CountAsync(cancellationToken);
     }
 
@@ -286,8 +287,27 @@ public class MongoOrganizationUnitRepository
     protected virtual async Task<IMongoQueryable<IdentityUser>> CreateGetMembersFilteredQueryAsync(
         OrganizationUnit organizationUnit,
         string filter = null,
+        bool includeChildren = false,
         CancellationToken cancellationToken = default)
     {
+        if (includeChildren)
+        {
+            var childrenIds = await (await GetMongoQueryableAsync(cancellationToken))
+                .Where(ou => ou.Code.StartsWith(organizationUnit.Code))
+                .Select(ou => ou.Id)
+                .ToListAsync(GetCancellationToken(cancellationToken));
+
+            return (await GetMongoQueryableAsync<IdentityUser>(cancellationToken))
+                .Where(u => u.OrganizationUnits.Any(uou => childrenIds.Contains(uou.OrganizationUnitId)))
+                .WhereIf<IdentityUser, IMongoQueryable<IdentityUser>>(
+                    !filter.IsNullOrWhiteSpace(),
+                    u =>
+                        u.UserName.Contains(filter) ||
+                        u.Email.Contains(filter) ||
+                        (u.PhoneNumber != null && u.PhoneNumber.Contains(filter))
+                );
+        }
+
         return (await GetMongoQueryableAsync<IdentityUser>(cancellationToken))
             .Where(u => u.OrganizationUnits.Any(uou => uou.OrganizationUnitId == organizationUnit.Id))
             .WhereIf<IdentityUser, IMongoQueryable<IdentityUser>>(
diff --git a/modules/identity/test/Volo.Abp.Identity.TestBase/Volo/Abp/Identity/OrganizationUnitRepository_Tests.cs b/modules/identity/test/Volo.Abp.Identity.TestBase/Volo/Abp/Identity/OrganizationUnitRepository_Tests.cs
index 8746c3a1fd..ce78147ace 100644
--- a/modules/identity/test/Volo.Abp.Identity.TestBase/Volo/Abp/Identity/OrganizationUnitRepository_Tests.cs
+++ b/modules/identity/test/Volo.Abp.Identity.TestBase/Volo/Abp/Identity/OrganizationUnitRepository_Tests.cs
@@ -267,6 +267,10 @@ public abstract class OrganizationUnitRepository_Tests<TStartupModule> : AbpIden
         var usersCount = await _organizationUnitRepository.GetMembersCountAsync(ou);
 
         usersCount.ShouldBeGreaterThan(1);
+
+        usersCount = await _organizationUnitRepository.GetMembersCountAsync(ou, includeChildren: true);
+
+        usersCount.ShouldBeGreaterThanOrEqualTo(2);
     }
 
     [Fact]
@@ -301,6 +305,9 @@ public abstract class OrganizationUnitRepository_Tests<TStartupModule> : AbpIden
         await _organizationUnitRepository.RemoveAllMembersAsync(ou);
         var newCount = await _organizationUnitRepository.GetMembersCountAsync(ou);
         newCount.ShouldBe(0);
+
+        newCount = await _organizationUnitRepository.GetMembersCountAsync(ou, includeChildren: true);
+        newCount.ShouldBe(0);
     }
 
     [Fact]