Frederick Knecht Detwiller (1882–1953) was an American painter, printmaker, and artist. Born on December 31, 1882, in Easton, Pennsylvania, he was the son of John J. Detwiller, a doctor, and Arabella Knecht Detwiller. He had studios in New York City; New Harbor, Maine; and Easton, Pennsylvania. His work includes oil paintings and watercolors of rural and urban scenes, some of which were exhibited at Carnegie Hall in NYC.