Matthew Aucoin (born April 4, 1990) is an American composer, conductor, pianist, and writer best known for his operas. Aucoin has received commissions from the Metropolitan Opera, Carnegie Hall, Lyric Opera of Chicago, the American Repertory Theater, the Peabody Essex Museum, Harvard University, and NPR's This American Life. He was appointed as Los Angeles Opera's first-ever Artist-in-Residence in 2016. He is a 2018 MacArthur Fellow.