Mickey Rooney

Timothy Dennis

Edmund Gwenn

Headmaster Justin

Ian Hunter

Roger Carlton

Freddie Bartholomew

Peter Carlton

Marta Linden

Winifred Dennis Carlton

Juanita Quigley

Jane 'The Runt' Dennis

Alan Mowbray

Mr. Duncan

Peter Lawford

Ronnie Kenvil

Raymond Severn

'Inky' Weeld

Harry Duff

Eton Student (uncredited)

Robert Lynn

Eton Student (uncredited)

Tina Thayer

Flossie Sampson (uncredited)

Norman Taurog