The cast of Rhinoceros includes Gene Wilder as Stanley, Zero Mostel as John, Karen Black as Daisy, Joe Silver as Norman, Robert Weil as Carl, Marilyn Chris as Mrs. Bingham, Percy Rodriguez as Mr. Nicholson, Robert Fields as Young Man, Melody Santangello as Young Woman, Don Calfa as Waiter, Lou Cutell as Cashier, and Howard Morton as Doctor.