diff --git a/src/Api/Public/Controllers/GroupsController.cs b/src/Api/Public/Controllers/GroupsController.cs
index f8717c543c..c43f345dd5 100644
--- a/src/Api/Public/Controllers/GroupsController.cs
+++ b/src/Api/Public/Controllers/GroupsController.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using System.Threading.Tasks;
@@ -52,6 +53,28 @@ namespace Bit.Api.Public.Controllers
             return new JsonResult(response);
         }
 
+        /// <summary>
+        /// Retrieve a groups's member ids
+        /// </summary>
+        /// <remarks>
+        /// Retrieves the unique identifiers for all members that are associated with this group. You need only
+        /// supply the unique group identifier that was returned upon group creation.
+        /// </remarks>
+        /// <param name="id">The identifier of the group to be retrieved.</param>
+        [HttpGet("{id}/member-ids")]
+        [ProducesResponseType(typeof(HashSet<Guid>), (int)HttpStatusCode.OK)]
+        [ProducesResponseType((int)HttpStatusCode.NotFound)]
+        public async Task<IActionResult> GetMemberIds(Guid id)
+        {
+            var group = await _groupRepository.GetByIdAsync(id);
+            if(group == null || group.OrganizationId != _currentContext.OrganizationId)
+            {
+                return new NotFoundResult();
+            }
+            var orgUserIds = await _groupRepository.GetManyUserIdsByIdAsync(id);
+            return new JsonResult(orgUserIds);
+        }
+
         /// <summary>
         /// List all groups.
         /// </summary>
diff --git a/src/Api/Public/Controllers/MembersController.cs b/src/Api/Public/Controllers/MembersController.cs
index 54f71dffe3..76c078e545 100644
--- a/src/Api/Public/Controllers/MembersController.cs
+++ b/src/Api/Public/Controllers/MembersController.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using System.Threading.Tasks;
@@ -16,17 +17,20 @@ namespace Bit.Api.Public.Controllers
     public class MembersController : Controller
     {
         private readonly IOrganizationUserRepository _organizationUserRepository;
+        private readonly IGroupRepository _groupRepository;
         private readonly IOrganizationService _organizationService;
         private readonly IUserService _userService;
         private readonly CurrentContext _currentContext;
 
         public MembersController(
             IOrganizationUserRepository organizationUserRepository,
+            IGroupRepository groupRepository,
             IOrganizationService organizationService,
             IUserService userService,
             CurrentContext currentContext)
         {
             _organizationUserRepository = organizationUserRepository;
+            _groupRepository = groupRepository;
             _organizationService = organizationService;
             _userService = userService;
             _currentContext = currentContext;
@@ -56,6 +60,28 @@ namespace Bit.Api.Public.Controllers
             return new JsonResult(response);
         }
 
+        /// <summary>
+        /// Retrieve a member's group ids
+        /// </summary>
+        /// <remarks>
+        /// Retrieves the unique identifiers for all groups that are associated with this member. You need only
+        /// supply the unique member identifier that was returned upon member creation.
+        /// </remarks>
+        /// <param name="id">The identifier of the member to be retrieved.</param>
+        [HttpGet("{id}/group-ids")]
+        [ProducesResponseType(typeof(HashSet<Guid>), (int)HttpStatusCode.OK)]
+        [ProducesResponseType((int)HttpStatusCode.NotFound)]
+        public async Task<IActionResult> GetGroupIds(Guid id)
+        {
+            var orgUser = await _organizationUserRepository.GetByIdAsync(id);
+            if(orgUser == null || orgUser.OrganizationId != _currentContext.OrganizationId)
+            {
+                return new NotFoundResult();
+            }
+            var groupIds = await _groupRepository.GetManyIdsByUserIdAsync(id);
+            return new JsonResult(groupIds);
+        }
+
         /// <summary>
         /// List all members.
         /// </summary>