Steve Martin as Navin R. Johnson

Bernadette Peters as Marie Kimble Johnson

Catlin Adams as Patty Bernstein

Mabel King as Mother

Richard Ward as Father

Carl Gottlieb as Iron Balls McGinty

Dick Anthony Williams as Taj

Bill Macy as Stan Fox

M. Emmet Walsh as Madman

Dick O'Neill as Frosty

Maurice Evans as Hobart

Helena Carroll as Hester

Ren Woods as Elvira

Pepe Serna as Punk #1

Sonny Terry as Blues Singer

Brownie McGhee as Blues Singer

Jackie Mason as Harry Hartounian

Sharon Johansen as Lenore Hartounian

Gene LeBell as Con Man

Carl Reiner as Carl Reiner the Celebrity

Larry Hankin as Circus Hand (uncredited)

Howard Hesseman as Carnival Worker (uncredited)

Rob Reiner as Truck Driver Picking Up Navin (uncredited)

Gailard Sartain as Guy with Cracked Airplane Seats (uncredited)

Lenny Montana as Con Man

William Schallert as Judge M.A. Loring

David Landsberg as Bank Manager

Domingo Ambriz as Father De Cordoba

Richard Foronjy as Con Man

Clete Roberts as Announcer

Frances E. Williams as Grandma Johnson

Lydia McGhee as Cleotis Johnson

Niko Denise Holmes as Satch Johnson

Shawn Harris as Pierre Johnson

Nyles Harris as Leroy Johnson (as Niles Harris)

Susan Denise Harrison as Lisa Johnson

Douglas S. Close as Fireman

Trinidad Silva as Punk

Alston Ahern as Bride

Lawrence Green as Father of the Bride

Ken Magee as Carnival Rube

Tom J. Delaney as Tourist

Alfred Dennis as Irving

Marc Loge as Farm Boy

Jon Leichter as Billy

Lillian Adams as Tillie

Joe Lynn as Voodoo Dancer

Maurice Marsac as French Waiter

Fred Lerner as Con Man

Jerry G. Velasco as Man in Garden

Kimberly Cameron as Disco Party

Elizabeth Macey as Disco Party

Richie Reiner as Disco Party

Daniel Trevor as Disco Party

Benjie Bancroft as Bailiff (uncredited)