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.
Benoni Burdeau Irwin was born on June 29, 1840, in Newmarket, Ontario, Canada to Jared Irwin (1803–1873) and Lydia Kennedy (1807–1871) and moved to upstate New York as a young man. His family were Quakers, originally from the Scottish Borders. The Canadian Irwins were Late Loyalists, i.e. those loyal to the British Crown who emigrated to Canada after the American Revolution had ended. Members of the Irwin family fought against the US during the War of 1812. Despite their participation in the Rebellion of 1837, Benoni Irwin was patronized by a Lieutenant-Governor of Upper Canada, thus launching his career.
He was a pupil of the National Academy of Design in New York City from 1861 to 1863. He spent considerable time in San Francisco, from c. 1871-1877. From 1877-1878, Irwin trained in Paris with the famous French portraitist Emile Auguste Carolus-Duran (1838 – 1917), and exhibited at the Salon de Paris in 1879. He returned to the United States in 1879, where he spent time in Boston and New Bedford, Massachusetts; Louisville, Kentucky, New York City, and Yonkers, throughout the 1880s and 1890s. In 1889 Irwin was elected into the National Academy of Design as an Associate Academician.
In 1873, while in California, Irwin married Adelaide (Adela) Vellejo Curtis (May 29, 1853–1932). She was the daughter of Lucian Curtis, a copper plate engraver and farmer, born in Coventry, Connecticut and Celia Carlton Perkins, born in Philadelphia, Pennsylvania. The Curtis family had come to San Francisco during the California Gold Rush in 1849 and, at one time, lived in the famous Rancho Petaluma Adobe owned by General Mariano Vallejo, a family friend.