diff --git a/src/Core/Repositories/IOrganizationUserRepository.cs b/src/Core/Repositories/IOrganizationUserRepository.cs
index 46d4e3527..c86c0f425 100644
--- a/src/Core/Repositories/IOrganizationUserRepository.cs
+++ b/src/Core/Repositories/IOrganizationUserRepository.cs
@@ -11,6 +11,7 @@ namespace Bit.Core.Repositories
     {
         Task<int> GetCountByOrganizationIdAsync(Guid organizationId);
         Task<int> GetCountByFreeOrganizationAdminUserAsync(Guid userId);
+        Task<int> GetCountByOrganizationOwnerUserAsync(Guid userId);
         Task<ICollection<OrganizationUser>> GetManyByUserAsync(Guid userId);
         Task<ICollection<OrganizationUser>> GetManyByOrganizationAsync(Guid organizationId, OrganizationUserType? type);
         Task<OrganizationUser> GetByOrganizationAsync(Guid organizationId, string email);
diff --git a/src/Core/Repositories/SqlServer/OrganizationUserRepository.cs b/src/Core/Repositories/SqlServer/OrganizationUserRepository.cs
index f5e6cb1dc..daa00e682 100644
--- a/src/Core/Repositories/SqlServer/OrganizationUserRepository.cs
+++ b/src/Core/Repositories/SqlServer/OrganizationUserRepository.cs
@@ -47,6 +47,19 @@ namespace Bit.Core.Repositories.SqlServer
             }
         }
 
+        public async Task<int> GetCountByOrganizationOwnerUserAsync(Guid userId)
+        {
+            using(var connection = new SqlConnection(ConnectionString))
+            {
+                var results = await connection.ExecuteScalarAsync<int>(
+                    "[dbo].[OrganizationUser_ReadCountByOrganizationOwnerUser]",
+                    new { UserId = userId },
+                    commandType: CommandType.StoredProcedure);
+
+                return results;
+            }
+        }
+
         public async Task<OrganizationUser> GetByOrganizationAsync(Guid organizationId, string email)
         {
             using(var connection = new SqlConnection(ConnectionString))
diff --git a/src/Core/Services/Implementations/UserService.cs b/src/Core/Services/Implementations/UserService.cs
index 584af5846..32692096b 100644
--- a/src/Core/Services/Implementations/UserService.cs
+++ b/src/Core/Services/Implementations/UserService.cs
@@ -18,6 +18,7 @@ namespace Bit.Core.Services
     {
         private readonly IUserRepository _userRepository;
         private readonly ICipherRepository _cipherRepository;
+        private readonly IOrganizationUserRepository _organizationUserRepository;
         private readonly IMailService _mailService;
         private readonly IPushService _pushService;
         private readonly IdentityErrorDescriber _identityErrorDescriber;
@@ -29,6 +30,7 @@ namespace Bit.Core.Services
         public UserService(
             IUserRepository userRepository,
             ICipherRepository cipherRepository,
+            IOrganizationUserRepository organizationUserRepository,
             IMailService mailService,
             IPushService pushService,
             IUserStore<User> store,
@@ -54,6 +56,7 @@ namespace Bit.Core.Services
         {
             _userRepository = userRepository;
             _cipherRepository = cipherRepository;
+            _organizationUserRepository = organizationUserRepository;
             _mailService = mailService;
             _pushService = pushService;
             _identityOptions = optionsAccessor?.Value ?? new IdentityOptions();
@@ -133,6 +136,22 @@ namespace Bit.Core.Services
             await _pushService.PushSyncSettingsAsync(user.Id);
         }
 
+        public override async Task<IdentityResult> DeleteAsync(User user)
+        {
+            // Check if user is the owner of any organizations.
+            var organizationOwnerCount = await _organizationUserRepository.GetCountByOrganizationOwnerUserAsync(user.Id);
+            if(organizationOwnerCount > 0)
+            {
+                return IdentityResult.Failed(new IdentityError
+                {
+                    Description = "You must leave or delete any organizations that you are the owner of first."
+                });
+            }
+
+            await _userRepository.DeleteAsync(user);
+            return IdentityResult.Success;
+        }
+
         public async Task<IdentityResult> RegisterUserAsync(User user, string masterPassword)
         {
             var result = await base.CreateAsync(user, masterPassword);
@@ -184,7 +203,7 @@ namespace Bit.Core.Services
                 return IdentityResult.Failed(_identityErrorDescriber.PasswordMismatch());
             }
 
-            if(!await base.VerifyUserTokenAsync(user, _identityOptions.Tokens.ChangeEmailTokenProvider, 
+            if(!await base.VerifyUserTokenAsync(user, _identityOptions.Tokens.ChangeEmailTokenProvider,
                 GetChangeEmailTokenPurpose(newEmail), token))
             {
                 return IdentityResult.Failed(_identityErrorDescriber.InvalidToken());
@@ -224,7 +243,7 @@ namespace Bit.Core.Services
             throw new NotImplementedException();
         }
 
-        public async Task<IdentityResult> ChangePasswordAsync(User user, string masterPassword, string newMasterPassword, 
+        public async Task<IdentityResult> ChangePasswordAsync(User user, string masterPassword, string newMasterPassword,
             IEnumerable<Cipher> ciphers, IEnumerable<Folder> folders, string privateKey)
         {
             if(user == null)
@@ -373,7 +392,7 @@ namespace Bit.Core.Services
 
             if(errors.Count > 0)
             {
-                Logger.LogWarning("User {userId} password validation failed: {errors}.", await GetUserIdAsync(user), 
+                Logger.LogWarning("User {userId} password validation failed: {errors}.", await GetUserIdAsync(user),
                     string.Join(";", errors.Select(e => e.Code)));
                 return IdentityResult.Failed(errors.ToArray());
             }
diff --git a/src/Sql/Sql.sqlproj b/src/Sql/Sql.sqlproj
index 1bcd66b72..90e88383a 100644
--- a/src/Sql/Sql.sqlproj
+++ b/src/Sql/Sql.sqlproj
@@ -179,5 +179,6 @@
     <Build Include="dbo\Stored Procedures\OrganizationUserOrganizationDetails_ReadByUserIdStatus.sql" />
     <Build Include="dbo\Stored Procedures\OrganizationUserUserDetails_ReadById.sql" />
     <Build Include="dbo\User Defined Types\GuidIdArray.sql" />
+    <Build Include="dbo\Stored Procedures\OrganizationUser_ReadCountByOrganizationOwnerUser.sql" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOrganizationOwnerUser.sql b/src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOrganizationOwnerUser.sql
new file mode 100644
index 000000000..33ba249be
--- /dev/null
+++ b/src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOrganizationOwnerUser.sql	
@@ -0,0 +1,14 @@
+CREATE PROCEDURE [dbo].[OrganizationUser_ReadCountByOrganizationOwnerUser]
+    @UserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        COUNT(1)
+    FROM
+        [dbo].[OrganizationUser] OU
+    WHERE
+        OU.[UserId] = @UserId
+        AND OU.[Type] = 0
+END
\ No newline at end of file
diff --git a/src/Sql/dbo/Stored Procedures/User_DeleteById.sql b/src/Sql/dbo/Stored Procedures/User_DeleteById.sql
index 9ceac6033..bcdf0a81d 100644
--- a/src/Sql/dbo/Stored Procedures/User_DeleteById.sql	
+++ b/src/Sql/dbo/Stored Procedures/User_DeleteById.sql	
@@ -6,6 +6,7 @@ BEGIN
     SET NOCOUNT ON
     DECLARE @BatchSize INT = 100
 
+    -- Delete ciphers
     WHILE @BatchSize > 0
     BEGIN
         BEGIN TRANSACTION User_DeleteById_Ciphers
@@ -23,12 +24,25 @@ BEGIN
 
     BEGIN TRANSACTION User_DeleteById
 
+    -- Delete collection users
+    DELETE
+        CU
+    FROM
+        [dbo].[CollectionUser] CU
+    INNER JOIN
+        [dbo].[OrganizationUser] OU ON OU.[Id] = CU.[OrganizationUserId]
+    WHERE
+        OU.[UserId] = @Id
+
+    -- Delete organization users
     DELETE
     FROM
-        [dbo].[Device]
+        [dbo].[OrganizationUser]
     WHERE
         [UserId] = @Id
+        AND [Type] != 0 -- 0 = owner
 
+    -- Finally, delete the user
     DELETE
     FROM
         [dbo].[User]