Robert Donat as Dr. Andrew Manson

Rosalind Russell as Christine Manson

Ralph Richardson as Dr. Philip Denny

Rex Harrison as Dr. Frederick Lawford

Emlyn Williams as Owen

Penelope Dudley-Ward as Toppy LeRoy

Francis L. Sullivan as Ben Chenkin

Mary Clare as Mrs. Orlando

Cecil Parker as Dr. Charles Every

Nora Swinburne as Mrs. Thornton

Edward Chapman as Joe Morgan

Athene Seyler as Lady Raebank

Felix Aylmer as Mr. Boon

Joyce Bland as Nurse Sharp

Percy Parsons as Mr. Stillman

Dilys Davies as Mrs. Page

Basil Gill as Doctor Page

Joss Ambler as Dr. A.H. Llewellyn

Cameron Hall as Man Who Buys Microscope (uncredited)

Bryan Herbert as Husband Whose Wife Has Typhoid (uncredited)

David Keir as Mr. Wickes (uncredited)

Joan Kemp-Welch as Nurse Assisting at Childbirth (uncredited)

Eliot Makeham as Jack the Pharmacist (uncredited)

Elliott Mason as District Nurse (uncredited)

Gus McNaughton as Tom Evans (uncredited)

Bernard Miles as Medical Aid Society Committee Member (uncredited)

Leslie Phillips as Girl (uncredited)

Kynaston Reeves as Doctor (uncredited)

Harry Terry as Miner (uncredited)

Ben Williams as Evan Lewis (uncredited)

D.J. Williams as Old Thomas (uncredited)