Peter Sellers

as Sir Guy Grand KG, KC, CBE

Ringo Starr

as Youngman Grand, Esq.

Isabel Jeans

as Dame Agnes Grand

Caroline Blakiston

as Hon. Esther Grand

Wilfrid Hyde-White

as Captain Reginald K. Klaus

Spike Milligan

as Traffic Warden

John Cleese

as Director in Sotheby's

Richard Attenborough

as Oxford Coach