Nicolas Poussin (1594-1665) was a French painter.
Poussin may also refer to: Poussin (chicken)
People with the surname Gaëtan Poussin (born 1999), French goalkeeper Gérald Poussin (born 1946), Swiss artist Gaspard Poussin (1615-1675), name sometimes given to the painter Gaspard Dughet, pupil and brother-in-law of Nicolas Poussin
See also Charles Jean de la Vallée-Poussin (1866-1962), Belgian mathematician Charles-Louis-Joseph-Xavier de la Vallée-Poussin (1827–1903), Belgian geologist and mineralogist, father of Charles Jean Théodore Poussin, a comic book series