Julie Christie as Petulia Danner

George C. Scott as Dr. Archie Bollen

Richard Chamberlain as Dave Danner

Arthur Hill as Barney

Shirley Knight as Polo

Pippa Scott as May

Kathleen Widdoes as Wilma

Richard Dysart as Motel Receptionist

Ruth Kobart as Nun

Roger Bowen as Warren

Joseph Cotten as Mr. Danner

Austin Pendleton as Intern (uncredited)

Ellen Geer as Nun

Howard Hesseman as Hippie (uncredited)

Janis Joplin as Herself (uncredited)

René Auberjonois as Fred Six (uncredited)

Peter Bonerz as Self (uncredited)

Barbara Bosson as Self (uncredited)

Kathryn Ish as Self (uncredited)

Josephine Nichols as Neighbor (uncredited)

Richard Stahl as Greenhouse fitter (uncredited)

Mel Stewart as Supermarket Clerk (uncredited)