Jack Lemmon as Hogan

Carol Lynley as Robin Austin

Edie Adams as Dr. Irene Wilson

Imogene Coca as Dorkus Murphy

Paul Lynde as Murphy

Dean Jones as Dave Manning

Robert Lansing as Dr. Charles Howard

Jane Wald as Liz

Linda Gray as College girl

Joy Harmon as Ardice

Irene Tsu as Suzy

Laurie Sibbald as Eve

Celeste Yarnall as College girl

Jerry Antes as Adam (uncredited)

Tom Anthony as Barber (uncredited)

Army Archerd as Writer (uncredited)

Phil Arnold as Delivery Man (uncredited)

Roger Bacon as Writer (uncredited)

Bill Bixby as Track Team Coach (uncredited)

Paul Bradley as Barbershop Customer (uncredited)

Gloria Calomee as Sandy (uncredited)

Cliff Carnell as Athletic Instructor (uncredited)

Verna Cornelius as College Girl (uncredited)

Pamela Curran as Dolores (uncredited)

Tony Dante as Barber (uncredited)

George DeNormand as Maitre D' (uncredited)

Maryesther Denver as Woman on Bus (uncredited)

Lyn Edgington as Peggy (uncredited)

Bill Erwin as Teacher (uncredited)

Charles Fogel as Barbershop Customer (uncredited)

George Ford as Restaurant Patron (uncredited)

Barbara Gayle as College Girl (uncredited)

Linda Gray as College Girl (uncredited)

Joy Harmon as Ardice (uncredited)

John Indrisano as Boxing Instructor (uncredited)

Erskine Johnson as Writer (uncredited)

Matty Jordan as Maitre D' (uncredited)

Asa Maynor as Cheryl (uncredited)

James Millhollin as Thin Man (uncredited)

George Nardelli as Barber (uncredited)

Monty O'Grady as Restaurant Patron (uncredited)

Tony Regan as Restaurant Patron (uncredited)

Edwin Rochelle as Restaurant Patron (uncredited)

Brady Rubin as Girl in Class (uncredited)

Françoise Ruggieri as College Girl (uncredited)

Cosmo Sardo as Barber (uncredited)

Almira Sessions as Woman (uncredited)

Gary Waynesmith as Josh (uncredited)