Rex Harrison

Dr. John Dolittle

Samantha Eggar

Emma Fairfax

Anthony Newley

Matthew Mugg

Richard Attenborough

Albert Blossom

Peter Bull

General Bellowes

Muriel Landers

Mrs. Blossom

William Dix

Tommy Stubbins

Geoffrey Holder

William Shakespeare X

Portia Nelson

Sarah Dolittle

Norma Varden

Lady Fetherington

Jesslyn Fax

Old Woman (uncredited)

Arthur Gould-Porter

Sir Rupert (uncredited)

Kendrick Huxham

Elderly Man (uncredited)

Queenie Leonard

Courtroom Spectator (uncredited)

Jack Raine

Vicar (uncredited)

Angelo Rossitto

Dwarf (uncredited)

Rufus

Dog (uncredited)

Ted Stanhope

Assistant Judge (uncredited)

Ginny Tyler

Polynesia (voice) (uncredited)