Comte de Lautréamont was the pseudonym of Isidore Lucien Ducasse (4 April 1846 – 24 November 1870), an Uruguayan-born French poet.
His only works, Les Chants de Maldoror and Poésies, had a major influence on modern literature, particularly on the Surrealists and the Situationists. He died at age 24.

Ducasse was born in Montevideo, Uruguay, to François Ducasse, a French consular officer and his wife, Jacquette-Célestine Davezac. Very little is known about Isidore's childhood, except that he was baptized on 16 November 1847, in the cathedral of Montevideo and that his mother died soon afterwards, probably due to an epidemic. During 1851, as a five-year-old, he experienced the end of the eight-year siege of Montevideo in the Argentine-Uruguayan war. Ducasse was brought up to speak three languages: French, Spanish and English.