Robert Cummings as George Petty, aka Andrew 'Andy' Tapp

Joan Caulfield as Prof. Victoria Braymore

Elsa Lanchester as Dr. Crutcher

Melville Cooper as Beardsley (Petty's butler, aka Uncle Ben)

Audrey Long as Mrs. Connie Manton Dezlow

Mary Wickes as Prof. Whitman

Frank Orth as Moody (process server)

John Ridgely as Patrolman

Dorothy Abbott as December Petty Girl (uncredited)

Gino Corrado as Brush and Easel Waiter (uncredited)

Pat Flaherty as Policeman #2 (uncredited)

James Griffith as Royal Roof Orchestra Leader (uncredited)

Tippi Hedren as Ice Box Petty Girl (uncredited)

Movita as Carmelita Moray (uncredited)

Ray Teal as Policeman #1 (uncredited)

Ian Wolfe as President Webb (uncredited)

Lyn Thomas as Patti McKenzie (uncredited)

Jean Spangler as Nightclub Patron (uncredited)