Dick Van Dyke

Caractacus Potts

Sally Ann Howes

Truly Scrumptious

Lionel Jeffries

Grandpa Potts

Gert Fröbe

Baron Bomburst

Anna Quayle

Baroness Bomburst

Benny Hill

Toymaker

James Robertson Justice

Lord Scrumptious

Robert Helpmann

Child Catcher

Barbara Windsor

Blonde

Davy Kaye

Admiral

Alexander Doré

First Spy

Bernard Spear

Second Spy

Stanley Unwin

Chancellor

Peter Arne

Captain of Guard

Heather Ripley

Jemima Potts

Adrian Hall

Jeremy Potts

Desmond Llewelyn

George Coggins

Victor Maddern

Junkman

Arthur Mullard

Cyril, Big Man

Ross Parker

Chef

Gerald Campion

Minister

Felix Felton

Minister

Monti DeLyle

Minister

Totti Truman Taylor

Duchess

Larry Taylor

Lieutenant

Max Bacon

Orchestra Leader

Max Wall

Inventor

John Heawood

Inventor

Michael Darbyshire

Inventor

Kenneth Waller

Inventor

Gerald Taylor

Inventor

Phil Collins

Vulgarian Teen

Robert Arditti

Dancer (uncredited)

Vic Armstrong

Cavalry Guard at Cannon (uncredited)

Michael Audreson

Peter (uncredited)

Theo Aygar

4th Minister (uncredited)

John Baskcomb

Castle Chef (uncredited)

Jimmy Berriman

Child in Castle (uncredited)

Eunice Black

Courtier (uncredited)

Bill Brandon

'Test your Strength' Attendant (uncredited)