John Mills

as John Hampden

Yvonne Mitchell

as Mrs. Stella Hampden

Alastair Sim

as Dr. Skillingworth

Jeremy Spenser

as L. W. Daventry

Andrew Ray

as Max Hampden

Peter Asher

as Johnny Hampden

Marie Lohr

as Grandmother

Sonia Williams

as Miss Betts

James Drake

as Kirkland