Robert Donat

Dr. Andrew Manson

Rosalind Russell

Christine Manson

Ralph Richardson

Dr. Philip Denny

Rex Harrison

Dr. Frederick Lawford

Emlyn Williams

Owen

Penelope Dudley-Ward

Toppy LeRoy

Francis L. Sullivan

Ben Chenkin

Mary Clare

Mrs. Orlando

Cecil Parker

Dr. Charles Every

Nora Swinburne

Mrs. Thornton

Edward Chapman

Joe Morgan

Athene Seyler

Lady Raebank

Felix Aylmer

Mr. Boon

Basil Gill

Doctor Page

Joss Ambler

Dr. A.H. Llewellyn

Cameron Hall

Man Who Buys Microscope (uncredited)

Bryan Herbert

Husband Whose Wife Has Typhoid (uncredited)

Joan Kemp-Welch

Nurse Assisting at Childbirth (uncredited)

Eliot Makeham

Jack the Pharmacist (uncredited)

Gus McNaughton

Tom Evans (uncredited)

Bernard Miles

Medical Aid Society Committee Member (uncredited)

Leslie Phillips

Girl (uncredited)

Kynaston Reeves

Doctor (uncredited)

Harry Terry

Miner (uncredited)