Adolphe Etienne Auguste Moreau-Nelaton (2 December 1859, Paris- 25 April 1927, Paris) was a French painter, art collector and art historian. His large collection is today held in its entirety by National French museums.
Moreau-Nelaton's family's art collecting began with his grandfather Adolphe Moreau (1800-59). As a stockbroker he possessed ample capital with which to buy the work of artists with whom he was personally acquainted, including Eugene Delacroix and Alexandre-Gabriel Decamps. Moreau-Nelaton's father, who was also named Adolphe Moureau (1827-82), was a high government official and led the railroad company Chemins de fer de l'Est. In 1856 he married the ceramic artist Camille Nelaton (1840-97), with whom he further expanded the family's collection.