diff --git a/Octokit.Reactive/Clients/IObservableOrganizationMembersClient.cs b/Octokit.Reactive/Clients/IObservableOrganizationMembersClient.cs
index 8e5a903bc0..a327040aaa 100644
--- a/Octokit.Reactive/Clients/IObservableOrganizationMembersClient.cs
+++ b/Octokit.Reactive/Clients/IObservableOrganizationMembersClient.cs
@@ -304,6 +304,21 @@ public interface IObservableOrganizationMembersClient
         /// <returns></returns>
         IObservable<OrganizationMembership> AddOrUpdateOrganizationMembership(string org, string user, OrganizationMembershipUpdate addOrUpdateRequest);
 
+        /// <summary>
+        /// Create an organization invitation for a user
+        /// </summary>
+        /// <remarks>
+        /// This method requires authentication.
+        /// The authenticated user must be an organization owner.
+        /// See the <a href="https://developer.github.com/v3/orgs/members/#create-an-organization-invitation">API documentation</a>
+        /// for more information.
+        /// </remarks>
+        /// <param name="org">The login for the organization</param>
+        /// <param name="invitationRequest">An <see cref="OrganizationInvitationRequest"/> instance containing the
+        /// details of the organization invitation</param>
+        /// <returns></returns>
+        IObservable<OrganizationMembershipInvitation> CreateOrganizationInvitation(string org, OrganizationInvitationRequest invitationRequest);
+        
         /// <summary>
         /// Remove a user's membership with an organization.
         /// </summary>
diff --git a/Octokit.Reactive/Clients/ObservableOrganizationMembersClient.cs b/Octokit.Reactive/Clients/ObservableOrganizationMembersClient.cs
index e258722c26..31d41f23ba 100644
--- a/Octokit.Reactive/Clients/ObservableOrganizationMembersClient.cs
+++ b/Octokit.Reactive/Clients/ObservableOrganizationMembersClient.cs
@@ -418,6 +418,27 @@ public IObservable<OrganizationMembership> AddOrUpdateOrganizationMembership(str
 
             return _client.AddOrUpdateOrganizationMembership(org, user, addOrUpdateRequest).ToObservable();
         }
+        
+        /// <summary>
+        /// Create an organization invitation for a user
+        /// </summary>
+        /// <remarks>
+        /// This method requires authentication.
+        /// The authenticated user must be an organization owner.
+        /// See the <a href="https://developer.github.com/v3/orgs/members/#create-an-organization-invitation">API documentation</a>
+        /// for more information.
+        /// </remarks>
+        /// <param name="org">The login for the organization</param>
+        /// <param name="invitationRequest">An <see cref="OrganizationInvitationRequest"/> instance containing the
+        /// details of the organization invitation</param>
+        /// <returns></returns>
+        public IObservable<OrganizationMembershipInvitation> CreateOrganizationInvitation(string org, OrganizationInvitationRequest invitationRequest)
+        {
+            Ensure.ArgumentNotNullOrEmptyString(org, nameof(org));
+            Ensure.ArgumentNotNull(invitationRequest, nameof(invitationRequest));
+
+            return _client.CreateOrganizationInvitation(org, invitationRequest).ToObservable();
+        }
 
         /// <summary>
         /// Remove a user's membership with an organization.