 Michael YorkD'Artagnan | D'Artagnan |
 Oliver ReedAthos | Athos |
 Richard ChamberlainAramis | Aramis |
 Frank FinlayPorthos | Porthos |
 Faye DunawayMilady de Winter | Milady de Winter |
 Christopher LeeRochefort | Rochefort |
 Raquel WelchConstance de Bonancieux | Constance de Bonancieux |
 Geraldine ChaplinQueen Anne of Austria | Queen Anne of Austria |
 Charlton HestonCardinal Richelieu | Cardinal Richelieu |
 Roy KinnearPlanchet | Planchet |
 Simon WardDuke of Buckingham | Duke of Buckingham |
 Jean-Pierre CasselLouis XIII | Louis XIII |
 Michael GothardFelton | Felton |
 Nicole CalfanMaid Kitty | Maid Kitty |
 Ángel del PozoJussac | Jussac |
 Eduardo FajardoOfficer | Officer |
 Sybil DanningEugenie | Eugenie |
 Gitty DjamalBeatrice | Beatrice |
 Jack WatsonBusigny | Busigny |
| RRichard AdamsTortured Thug | Tortured Thug |
 Bob ToddFiring Squad Officer | Firing Squad Officer |
| TTom BuchananFiring Squad Sergeant | Firing Squad Sergeant |
| NNorman ChappellSubmarine Inventor | Submarine Inventor |
 Leon GreeneSwiss Officer | Swiss Officer |
| LLucy TillerMother Superior | Mother Superior |
| TTyrone CassidyEnglish Officer | English Officer |
 Oliver MacGreevyHeadsman (uncredited) | Headsman (uncredited) |
 Joss AcklandD'Artagnan's Father (archive footage) (uncredited) | D'Artagnan's Father (archive footage) (uncredited) |
 Gretchen FranklinD'Artagnan's Mother (archive footage) (uncredited) | D'Artagnan's Mother (archive footage) (uncredited) |
 Richard BriersLouis XIII (voice) (uncredited) | Louis XIII (voice) (uncredited) |
