Anton Gag (12 June 1859 – 22 May 1908) was a Sudeten-American painter and studio photographer known for his portraits, still lifes, landscapes, and murals. Immigrating to the United States at the age of 14 with his family in 1873, he later settled in New Ulm, Minnesota, where he spent most of his working life. Together with other local painters, Gag decorated altars and walls of several churches in the area. He and a partner also produced a large panorama with eleven panels on the Dakota War of 1862. One of his paintings of the Battle of New Ulm hangs in the Minnesota Capitol building.