Olivier d'Athos de la Fère (born c. 1595; died 1661) is a fictional character, a Musketeer of the Guard in the novels The Three Musketeers, Twenty Years After, and The Vicomte de Bragelonne by Alexandre Dumas, père. In The Three Musketeers, he and the other two musketeers Porthos and Aramis are friends of the novel's protagonist, d'Artagnan. He has a mysterious past connecting him with the villainess of the novel, Milady de Winter. By the end of the novel, it is revealed that he is the Comte de la Fère, who was Milady's husband before she married the Baron de Winter.