Rex Harrison as Andrew Undershaft
Sally Ann Howes as Barbara Undershaft
Robert Morley as Stephen Undershaft
Deborah Kerr as Lady Britomart Undershaft
Terence Stamp as Cusins
Simon Ward as Charles Lomax
John Fraser as Adolphus Cusins
Moultrie Kelsall as Rummy Mitchens
Tutte Lemkow as Peter Shirley
Clive Francis as Bill Walker
Harold Innocent as Snobby Price
Michael Trubshawe as Major Barbara's fiance
James Culliford as Morrison