Peter Sellers as Harold

Jo Van Fleet as Mother

Leigh Taylor-Young as Nancy

Joyce Van Patten as Joyce

David Arkin as Herbie

Herb Edelman as Murray

Salem Ludwig as Father

Louis Gottlieb as Guru

Grady Sutton as Funeral Director

Janet Clark as Mrs. Foley

Jorge Moreno as Mr. Rodriguez

Ed Peck as Man in Dress Shop

Jack Margolis as Big Bear

Eddra Gale as Love Lady

Carol O'Leary as Anita

Christian Brando as El Greco

Sidney Clute as Mechanic

Roy Glenn as Gas Station Attendant

Joe Dominguez as Grandfather Rodriguez

William Bramley as 1st Patrolman

Vince Howard as 2nd Patrolman

Robert Miller Driscoll as Crying Hippie

Karen McKevic as Crying Hippie's Wife

Paul Mazursky as Hippie on Sidewalk (uncredited)

Uschi Digard as Hippie Extra (uncredited)

Guy Way as Driver (uncredited)

Julian Rivero as Rodriguez Family Member (uncredited)

George DeNormand as Mourner (uncredited)

Ethelreda Leopold as Mourner (uncredited)

Lovyss Bradley as Mourner (uncredited)

Bobbie Shaw Chance as Maid of Honor (uncredited)

Hy Averback as Rabbi Conducting Wedding Ceremony (uncredited)

Alma Beltran as Rodriguez Family Member (uncredited)