Phil Harris as O'Malley (voice)

Eva Gabor as Duchess (voice)

Sterling Holloway as Roquefort (voice)

Scatman Crothers as Scat Cat (voice)

Paul Winchell as Chinese Cat (voice)

Lord Tim Hudson as English Cat (voice)

Vito Scotti as Italian Cat (voice)

Thurl Ravenscroft as Russian Cat (voice)

Dean Clark as Berlioz (voice)

Liz English as Marie (voice)

Gary Dubin as Toulouse (voice)

Nancy Kulp as Frou-Frou (voice)

Pat Buttram as Napoleon (voice)

George Lindsey as Lafayette (voice)

Monica Evans as Abigail (voice)

Carole Shelley as Amelia (voice)

Charles Lane as Lawyer (voice)

Hermione Baddeley as Madame (voice)

Roddy Maude-Roxby as Butler (voice)

Bill Thompson as Uncle Waldo (voice)

Ruth Buzzi as Frou-Frou (singing voice) (uncredited)

June Foray as Cat Screeches (uncredited)

Clarence Nash as Cat Screeches (uncredited)

Peter Renaday as Milkman / Le Petit Café Cook / Truck Movers (voice) (uncredited)