The Three Musketeers (Les Trois Mousquetaires) is a historical adventure novel by Alexandre Dumas. It is one of the most famous works of French literature and has been adapted into numerous films, TV series, and stage productions.

Set in 17th-century France, the novel follows d'Artagnan, a young and ambitious man from Gascony, who travels to Paris with the dream of becoming a Musketeer of the Guard. Upon his arrival, he inadvertently challenges three of the King's Musketeers-Athos, Porthos, and Aramis-to duels. However, they soon become allies when they fight together against the Cardinal's Guards.

D'Artagnan becomes involved in political and romantic intrigues, including a mission to protect Queen Anne's honor from the scheming Cardinal Richelieu and the dangerous Milady de Winter. Alongside his newfound comrades, he must navigate betrayals, duels, and secret plots in a story filled with action, romance, and humor.

The novel has inspired countless adaptations, including movies, TV shows, and even comics. Its themes of brotherhood and adventure have made it a timeless classic.