Benoni Irwin (June 29, 1840 – August 26, 1896) was an American portraitist. A pupil of the National Academy of Design in New York City, USA, he trained in Paris with the famous French portraitist Emile Auguste Carolus-Duran (1838–1917). His work was shown in the Exposition Universelle at Paris in 1889, and the Chicago World's Fair in 1893. Irwin had studios in San Francisco, Boston, New Bedford, and New York.