David Niven as Jonathan Kingsley

Lola Albright as Alice Kingsley

Chad Everett as Richard Merrick

Ozzie Nelson as Dr. Herbert J. Fleischer

Cristina Ferrare as Linda Kingsley

Jeff Cooper as Bartholomew Smuts

John Harding as Dean Harvey Rockwell

Rich Chalet as Freddie Fleischer

Michael McGreevey as Andy McClaine

Darleen Carr as Abbey Kingsley

Don Beddoe as Dr. Elliot Fish

Louise Lorimer as Mrs. Celia Fish

Karen Norris as Mrs. Rockwell

Susan French as Miss Hammer

Trudi Ames as Francine

J. Edward McKinley as Dr. Pepperell

Ned Wertimer as Dr. Bodey

Jon Hill as College Student (uncredited)

Kenner G. Kemp as Policeman (uncredited)

Leoda Richards as Party Guest (uncredited)

Rudy Germane as Stage Manager (uncredited)

Dee Carroll as Jonathan's Secretary (uncredited)