Richard Harris as Oliver Cromwell

Alec Guinness as King Charles I

Robert Morley as The Earl of Manchester

Dorothy Tutin as Queen Henrietta Maria

Frank Finlay as John Carter

Timothy Dalton as Prince Rupert

Patrick Wymark as The Earl of Strafford

Patrick Magee as Hugh Peters

Nigel Stock as Sir Edward Hyde

Patrick Holt as Captain Lundsford

Charles Gray as The Earl of Essex

Michael Jayston as Henry Ireton

Michael Goodliffe as Solicitor General

Jack Gwillim as General Byron

Richard Cornish as Oliver Cromwell II

Anna Cropper as Ruth Carter

George Merritt as William

Basil Henson as Hacker

Stratford Johns as President Bradshaw

Geoffrey Keen as John Pym

Douglas Wilmer as Sir Thomas Fairfax

Anthony May as Richard Cromwell

Ian McCulloch as John Hampden

Robin Stewart as Charles - Prince of Wales

Zena Walker as Mrs. Cromwell

John Paul as General Digby

John Welsh as Bishop Juxon

André van Gyseghem as Archbishop Rinuccini

Anthony Kemp as Henry Cromwell

Stacy Dorning as Mary Cromwell

Mel Churcher as Bridget Cromwell

Josephine Gillick as Elizabeth Cromwell

Llewellyn Rees as Speaker

John Forbes-Robertson as Colonel Harrison

Roy Beck as Member of Parliment (uncredited)