Richard Egan as Ken Jorgenson

Dorothy McGuire as Sylvia Hunter

Sandra Dee as Molly Jorgenson

Arthur Kennedy as Bart Hunter

Troy Donahue as Johnny Hunter

Beulah Bondi as Mrs. Emily Hamilton Hamble

Constance Ford as Helen Jorgenson

Jack Richardson as Claude Andrews

Martin Eric as Todd Harper, Handyman at Pine Island Inn

Eleanor Audley as Waiting Guest at Molly's College (uncredited)

Marshall Bradford as Dr. Matthias (uncredited)

Phil Chambers as Sheriff (uncredited)

Joe Connors as Driver (uncredited)

Peter Constanti as Captain of Yacht (uncredited)

Richard Deacon as Pawnbroker (uncredited)

Ann Doran as Mrs. Talbert (uncredited)

Gertrude Flynn as Helen's Mother (uncredited)

Bonnie Franklin as Girl in Dormitory (uncredited)

Everett Glass as Dean (uncredited)

Robert Griffin as Engelhardt (uncredited)

Howard Hoffman as Justice of the Peace Alvin Frost (uncredited)

Cheryl Holdridge as Girl in Dormitory (uncredited)

Rankin Mansfield as Attorney (uncredited)

Fred Marlow as Cab Driver (uncredited)

Lewis Martin as Doctor (uncredited)

Junius Matthews as Mr. Hamble (uncredited)

Nancy Matthews as Girl in Dormitory (uncredited)

Dale J. Nicholson as Minister (uncredited)

Susan Odin as Girl in Dormitory (uncredited)

Donald G. Sheely as Attendant (uncredited)

Roberta Shore as Anne Talbert (uncredited)

Arthur Space as Ken's Attorney (uncredited)

George Taylor as Bart's Attorney (uncredited)

Helen Wallace as Wife of Justice of the Peace (uncredited)

Cecil Weston as Operator (uncredited)