Michael York
D'Artagnan

Oliver Reed
Athos

Richard Chamberlain
Aramis

Frank Finlay
Porthos

Faye Dunaway
Milady de Winter

Christopher Lee
Rochefort

Raquel Welch
Constance de Bonancieux

Geraldine Chaplin
Queen Anne of Austria

Charlton Heston
Cardinal Richelieu

Roy Kinnear
Planchet

Simon Ward
Duke of Buckingham

Jean-Pierre Cassel
Louis XIII

Michael Gothard
Felton

Nicole Calfan
Maid Kitty

Ángel del Pozo
Jussac

Eduardo Fajardo
Officer

Sybil Danning
Eugenie

Gitty Djamal
Beatrice

Jack Watson
Busigny

Bob Todd
Firing Squad Officer

Leon Greene
Swiss Officer

Oliver MacGreevy
Headsman (uncredited)

Joss Ackland
D'Artagnan's Father (archive footage) (uncredited)

Gretchen Franklin
D'Artagnan's Mother (archive footage) (uncredited)

Richard Briers
Louis XIII (voice) (uncredited)

John Bluthal
English Officer/Innkeeper and other roles (voice) (uncredited)