Rex Harrison
as Dr. John Dolittle

Samantha Eggar
as Emma Fairfax

Anthony Newley
as Matthew Mugg

Richard Attenborough
as Albert Blossom

Peter Bull
as General Bellowes

Muriel Landers
as Mrs. Blossom

William Dix
as Tommy Stubbins

Geoffrey Holder
as William Shakespeare X

Portia Nelson
as Sarah Dolittle

Norma Varden
as Lady Fetherington

Frank Baker
as Trial Spectator (uncredited)

Edward Cast
as Prison Guard (uncredited)

Phyllis Coghlan
as Courtroom Spectator (uncredited)

Robert Cole
as Roustabout (uncredited)

Cyril Cross
as Charlie (uncredited)

Peter Crowcroft
as Assistant Judge (uncredited)

John Dolan
as Fisherman (uncredited)

Jesslyn Fax
as Old Woman (uncredited)

Arthur Gould-Porter
as Sir Rupert (uncredited)

Eric Heath
as Courtroom Spectator (uncredited)

Lars Hensen
as Minor Role (uncredited)

Kendrick Huxham
as Elderly Man (uncredited)

Theron Jackson
as Boy (uncredited)

Queenie Leonard
as Courtroom Spectator (uncredited)

Frank Radcliffe
as Strong Man (uncredited)

Jack Raine
as Vicar (uncredited)

Danny Rees
as Juggler (uncredited)

Angelo Rossitto
as Dwarf (uncredited)

Rufus
as Dog (uncredited)

Ted Stanhope
as Assistant Judge (uncredited)

Geoffrey Steele
as Courtroom Spectator (uncredited)

Gilchrist Stuart
as The Vicar (uncredited)

Ginny Tyler
as Polynesia (voice) (uncredited)

Bob Winters
as Juggler (uncredited)

Judy Chapman
as Dancer (uncredited)