Alexandre Mercereau, Paris, 22 October 1884 – 1945, was a French symbolist poet and critic associated with Unanimism and the Abbaye de Créteil. He founded the Villa Médicis Libre, which helped impoverished artists and operated as charitable reformatory for delinquent teenagers. Mercereau's work inspired the revolutionary artistic movement of the early 20th century known as Cubism.