diff --git a/src/Api/Controllers/OrganizationUsersController.cs b/src/Api/Controllers/OrganizationUsersController.cs
index 5734fe00fa..75953836af 100644
--- a/src/Api/Controllers/OrganizationUsersController.cs
+++ b/src/Api/Controllers/OrganizationUsersController.cs
@@ -92,7 +92,7 @@ namespace Bit.Api.Controllers
             }
 
             var userId = _userService.GetProperUserId(User);
-            var result = await _organizationService.InviteUserAsync(orgGuidId, userId.Value, model.Email, model.Type.Value,
+            var result = await _organizationService.InviteUserAsync(orgGuidId, userId.Value, model.Emails, model.Type.Value,
                 model.AccessAll, null, model.Collections?.Select(c => c.ToSelectionReadOnly()));
         }
 
diff --git a/src/Core/Models/Api/Request/Organizations/OrganizationUserRequestModels.cs b/src/Core/Models/Api/Request/Organizations/OrganizationUserRequestModels.cs
index e694a4fcce..01eeb44b7e 100644
--- a/src/Core/Models/Api/Request/Organizations/OrganizationUserRequestModels.cs
+++ b/src/Core/Models/Api/Request/Organizations/OrganizationUserRequestModels.cs
@@ -1,18 +1,41 @@
 using Bit.Core.Models.Table;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System;
+using System.Linq;
 
 namespace Bit.Core.Models.Api
 {
-    public class OrganizationUserInviteRequestModel
+    public class OrganizationUserInviteRequestModel : IValidatableObject
     {
         [Required]
-        [EmailAddress]
-        public string Email { get; set; }
+        public IEnumerable<string> Emails { get; set; }
         [Required]
         public Enums.OrganizationUserType? Type { get; set; }
         public bool AccessAll { get; set; }
         public IEnumerable<SelectionReadOnlyRequestModel> Collections { get; set; }
+
+        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
+        {
+            if(!Emails.Any())
+            {
+                yield return new ValidationResult("An email is required.");
+            }
+
+            if(Emails.Count() > 20)
+            {
+                yield return new ValidationResult("You can only invite up to 20 users at a time.");
+            }
+
+            var attr = new EmailAddressAttribute();
+            for(int i = 0; i < Emails.Count(); i++)
+            {
+                if(!attr.IsValid(Emails.ElementAt(i)))
+                {
+                    yield return new ValidationResult($"Email #{i + 1} is not valid.", new string[] { nameof(Emails) });
+                }
+            }
+        }
     }
 
     public class OrganizationUserAcceptRequestModel
diff --git a/src/Core/Services/IOrganizationService.cs b/src/Core/Services/IOrganizationService.cs
index f3beac650f..e26ece8e07 100644
--- a/src/Core/Services/IOrganizationService.cs
+++ b/src/Core/Services/IOrganizationService.cs
@@ -23,6 +23,8 @@ namespace Bit.Core.Services
         Task UpdateAsync(Organization organization, bool updateBilling = false);
         Task<OrganizationUser> InviteUserAsync(Guid organizationId, Guid invitingUserId, string email,
             OrganizationUserType type, bool accessAll, string externalId, IEnumerable<SelectionReadOnly> collections);
+        Task<List<OrganizationUser>> InviteUserAsync(Guid organizationId, Guid invitingUserId, IEnumerable<string> emails,
+            OrganizationUserType type, bool accessAll, string externalId, IEnumerable<SelectionReadOnly> collections);
         Task ResendInviteAsync(Guid organizationId, Guid invitingUserId, Guid organizationUserId);
         Task<OrganizationUser> AcceptUserAsync(Guid organizationUserId, User user, string token);
         Task<OrganizationUser> ConfirmUserAsync(Guid organizationId, Guid organizationUserId, string key, Guid confirmingUserId);
diff --git a/src/Core/Services/Implementations/OrganizationService.cs b/src/Core/Services/Implementations/OrganizationService.cs
index c6cc9ec06e..d7e460d8f6 100644
--- a/src/Core/Services/Implementations/OrganizationService.cs
+++ b/src/Core/Services/Implementations/OrganizationService.cs
@@ -685,6 +685,15 @@ namespace Bit.Core.Services
 
         public async Task<OrganizationUser> InviteUserAsync(Guid organizationId, Guid invitingUserId, string email,
             OrganizationUserType type, bool accessAll, string externalId, IEnumerable<SelectionReadOnly> collections)
+        {
+            var result = await InviteUserAsync(organizationId, invitingUserId, new List<string> { email }, type, accessAll,
+                externalId, collections);
+            return result.FirstOrDefault();
+        }
+
+        public async Task<List<OrganizationUser>> InviteUserAsync(Guid organizationId, Guid invitingUserId,
+            IEnumerable<string> emails, OrganizationUserType type, bool accessAll, string externalId,
+            IEnumerable<SelectionReadOnly> collections)
         {
             var organization = await _organizationRepository.GetByIdAsync(organizationId);
             if(organization == null)
@@ -695,45 +704,52 @@ namespace Bit.Core.Services
             if(organization.Seats.HasValue)
             {
                 var userCount = await _organizationUserRepository.GetCountByOrganizationIdAsync(organizationId);
-                if(userCount >= organization.Seats.Value)
+                var availableSeats = organization.Seats.Value - userCount;
+                if(availableSeats >= emails.Count())
                 {
                     throw new BadRequestException("You have reached the maximum number of users " +
                         $"({organization.Seats.Value}) for this organization.");
                 }
             }
 
-            // Make sure user is not already invited
-            var existingOrgUser = await _organizationUserRepository.GetByOrganizationAsync(organizationId, email);
-            if(existingOrgUser != null)
+            var orgUsers = new List<OrganizationUser>();
+            foreach(var email in emails)
             {
-                throw new BadRequestException("User already invited.");
+                // Make sure user is not already invited
+                var existingOrgUser = await _organizationUserRepository.GetByOrganizationAsync(organizationId, email);
+                if(existingOrgUser != null)
+                {
+                    throw new BadRequestException("User already invited.");
+                }
+
+                var orgUser = new OrganizationUser
+                {
+                    OrganizationId = organizationId,
+                    UserId = null,
+                    Email = email.ToLowerInvariant(),
+                    Key = null,
+                    Type = type,
+                    Status = OrganizationUserStatusType.Invited,
+                    AccessAll = accessAll,
+                    ExternalId = externalId,
+                    CreationDate = DateTime.UtcNow,
+                    RevisionDate = DateTime.UtcNow
+                };
+
+                if(!orgUser.AccessAll && collections.Any())
+                {
+                    await _organizationUserRepository.CreateAsync(orgUser, collections);
+                }
+                else
+                {
+                    await _organizationUserRepository.CreateAsync(orgUser);
+                }
+
+                await SendInviteAsync(orgUser);
+                orgUsers.Add(orgUser);
             }
 
-            var orgUser = new OrganizationUser
-            {
-                OrganizationId = organizationId,
-                UserId = null,
-                Email = email.ToLowerInvariant(),
-                Key = null,
-                Type = type,
-                Status = OrganizationUserStatusType.Invited,
-                AccessAll = accessAll,
-                ExternalId = externalId,
-                CreationDate = DateTime.UtcNow,
-                RevisionDate = DateTime.UtcNow
-            };
-
-            if(!orgUser.AccessAll && collections.Any())
-            {
-                await _organizationUserRepository.CreateAsync(orgUser, collections);
-            }
-            else
-            {
-                await _organizationUserRepository.CreateAsync(orgUser);
-            }
-
-            await SendInviteAsync(orgUser);
-            return orgUser;
+            return orgUsers;
         }
 
         public async Task ResendInviteAsync(Guid organizationId, Guid invitingUserId, Guid organizationUserId)