Alec Guinness as Henry 'Dutch' Holland

Stanley Holloway as Albert Pendlebury

Sid James as Lackery

Alfie Bass as Shorty

Marjorie Fielding as Mrs. Chalk

Edie Martin as Miss Evesham

John Salew as Parkin

Ronald Adam as Turner

Arthur Hambling as Wallis

Gibb McLaughlin as Godwin

John Gregson as Farrow

Clive Morton as Station Sergeant

Sydney Tafler as Clayton

Marie Burke as Señora Gallardo

Audrey Hepburn as Chiquita

William Fox as Gregory

Michael Trubshawe as British Ambassador

Ann Heffernan as Kiosk Girl

Jacques Brunius as Customs Official

Eugene Deckers as Customs Official

Paul Demel as Customs Official

Andreas Malandrinos as Customs Official

Cyril Chamberlain as Commander

Tony Quinn as Deputy Commander

Moultrie Kelsall as Detective Superintendant

Christopher Hewett as Inspector Talbot

Meredith Edwards as P. C. Williams

Patrick Barr as Divisional Detective Inspector

David Davies as City Policeman

Robert Shaw as Chemist at Police Exhibition

Richard Davies as Police Driver

Howard Lang as Policeman at window (uncredited)

George Spence as Racegoer (uncredited)