Warren Beatty as Vincent Bruce

Jean Seberg as Lilith Arthur

Peter Fonda as Stephen Evshevsky

Kim Hunter as Dr. Bea Brice

Anne Meacham as Mrs. Yvonne Meaghan

Jessica Walter as Laura

Gene Hackman as Norman

James Patterson as Dr. Lavrier

Robert Reilly as Bob Clayfield

René Auberjonois as Howie (uncredited)

Jeanne Barr as Miss Glassman (uncredited)

Maurice Brenner as Mr. Gordon (uncredited)

Ben Carruthers as Benito (uncredited)

Olympia Dukakis as Patient (uncredited)

Edith Fellows as Patient (uncredited)

Alice Spivak as Lonely Girl (uncredited)

Tina Pine as Patient (uncredited)