diff --git a/src/controllers/GroupsController.ts b/src/controllers/GroupsController.ts
index c9de1bf..5a621f2 100644
--- a/src/controllers/GroupsController.ts
+++ b/src/controllers/GroupsController.ts
@@ -496,6 +496,26 @@ export class GroupsController {
 		h.send(this.GroupMemberToAPI(membership));
 	}
 
+	/**
+	 * Cancel a group membership invitation
+	 * 
+	 * @param h Request handler
+	 */
+	public static async CancelInvitation(h: RequestHandler) {
+		const groupID = await h.postGroupIDWithAccess("groupID", GroupsAccessLevel.MODERATOR_ACCESS);
+		const userID = await h.postUserId("userID");
+
+		if(await GroupsHelper.GetMembershipLevel(groupID, userID) != GroupMembershipLevels.INVITED)
+			h.error(401, "This user has not been invited to join this group!");
+		
+		// Cancel group invitation
+		await GroupsHelper.DeleteMember(groupID, userID);
+
+		// TODO : delete related notifications
+
+		h.success("Membership invitation has been cancelled!");
+	}
+
 	/**
 	 * Turn a GroupInfo object into a valid API object
 	 * 
diff --git a/src/controllers/Routes.ts b/src/controllers/Routes.ts
index ae504de..965662c 100644
--- a/src/controllers/Routes.ts
+++ b/src/controllers/Routes.ts
@@ -122,4 +122,6 @@ export const Routes : Route[] = [
 	{path: "/groups/respond_request", cb: (h) => GroupsController.RespondRequest(h)},
 
 	{path: "/groups/get_membership", cb: (h) => GroupsController.GetMembership(h)},
+
+	{path: "/groups/cancel_invitation", cb: (h) => GroupsController.CancelInvitation(h)},
 ]
\ No newline at end of file