Albin Kasper Longren (January 18, 1882 – November 19, 1950) was an American aviation pioneer from the state of Kansas. Beginning in 1911, Longren successfully flew airplanes of his own design and construction. Fully self-taught as an aircraft designer and pilot, he built a thriving career as a barnstormer with his own craft, becoming known throughout the Midwest as the "Birdman".