Porthos, Baron du Vallon de Bracieux de Pierrefonds is a fictional character in the novels "The Three Musketeers" (1844), "Twenty Years After" (1845), and "The Vicomte de Bragelonne" (1847-1850) by Alexandre Dumas, père. He and the other two musketeers, Athos and Aramis, are friends of the novel's protagonist, d'Artagnan. Porthos is a highly fictionalized version of the historical musketeer Isaac de Porthau.

Porthos, honest and slightly gullible, is the extrovert of the group, enjoying wine, women and song. Though he is often seen as the comic relief, he is also extremely dedicated and loyal toward his friends and fellow Musketeers and stands out for his physical strength and size. His eating abilities even impress King Louis XIV during a banquet at Fontainebleau. As the story advances, he looks more and more like a giant, and his death is that of a titan.

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