Judy Holliday as Ella Peterson

Dean Martin as Jeffrey Moss

Fred Clark as Larry Hastings

Eddie Foy Jr. as J. Otto Prantz

Jean Stapleton as Sue

Ruth Storey as Gwynne

Dort Clark as Inspector Barnes

Frank Gorshin as Blake Barton

Ralph Roberts as Francis

Valerie Allen as Olga

Bernie West as Joe Kitchell

Steve Peck as Gangster (uncredited)

Gerry Mulligan as Ella's Blind Date

Jimmy Ames as Bernie

Lela Bliss as Party Guest (uncredited)

Donna Douglas as Party Guest (uncredited)

Oliver Blake as Ludwig Smiley (uncredited)

Herb Vigran as Barney Lampwick (uncredited)

Len Lesser as Charlie Bessemer (uncredited)

Barbara Hines as Party Guest (uncredited)

Marina Koshetz as Mme Grimaldi (uncredited)

Hal Linden as Singer (uncredited)

Titus Moede as Beatnik (uncredited)

Nina Roman as Actress (uncredited)

Maida Severn as (uncredited)

Olan Soule as Nervous Man (uncredited)

Doris Wiss as Actress (uncredited)

Elizabeth Montgomery as Girl Reading Book (uncredited)

Jean Moorhead as Party Guest (uncredited)