Alexandre Dumas (born Dumas Davy de la Pailleterie, 24 July 1802 – 5 December 1870), also known as Alexandre Dumas, père, was a French writer, best known for his historical novels of high adventure. Translated into nearly 100 languages, these have made him one of the most widely read French authors in the world. Many of his novels, including The Count of Monte Cristo, The Three Musketeers, Twenty Years After, and The Vicomte de Bragelonne: Ten Years Later were originally published as serials. His novels have been adapted since the early twentieth century for nearly 200 films. Dumas' last novel, The Knight of Sainte-Hermine, unfinished at his death, was completed by a scholar and published in 2005, becoming a bestseller. It was published in English in 2008 as The Last Cavalier.

Prolific in several genres, Dumas began his career by writing plays, which were successfully produced from the first. He also wrote numerous magazine articles and travel books; his published works totaled 100,000 pages. In the 1840s, Dumas founded the Théâtre Historique in Paris.

His father, general Thomas-Alexandre Davy de la Pailleterie, was born in Saint-Domingue from a French nobleman and a black slave woman, thus Alexandre Dumas was of mixed heritage. As a young man, Dumas' aristocratic rank helped him acquire work with Louis-Philippe, Duke of Orléans.

With the election of Louis-Napoléon Bonaparte in 1851, Dumas fell from favor, and left France for Belgium, where he stayed for several years. Upon leaving Belgium, Dumas moved to Russia for a few years, before going to Italy. In 1861 he founded and published the newspaper, L' Indipendente, which supported the Italian unification effort. In 1864 he returned to Paris.

Married, Dumas also had numerous affairs, said to total 40. He was known to have at least four illegitimate or "natural" children, including a boy named Alexandre Dumas after him. This son became a successful novelist and playwright, and was known as Alexandre Dumas, fils (son), while the elder Dumas became conventionally known in French as Alexandre Dumas, père (father). Among his affairs, in 1866 Dumas had one with Adah Isaacs Menken, an American actress then at the height of her career and less than half his age. Twentieth-century scholars have found that Dumas fathered another three natural children.

At his death in December 1870, Dumas was originally buried at his birthplace of Villers-Cotterêts in the department of Aisne. His death was overshadowed by the Franco-Prussian War and later, changing fashions decreased his popularity. In the late twentieth century, scholars such as Reginald Hamel and Claude Schopp have caused a critical reappraisal and new appreciation of his art, as well as finding lost works. These contributed to the ceremony in 2002 to reinter Dumas in the Panthéon de Paris, an honor reserved for the great in French culture.