The Gillette-Tyrrell Building is a building in downtown Tulsa, Oklahoma. It was begun in 1929 by two Tulsa oilmen, J. M. Gillette and H. C. Tyrrell. They initially planned to construct a three-story office building at 432 S. Boulder Avenue, topped by a ten-story hotel, but these plans were canceled during the Great Depression and they stopped construction at the third floor. In 1931, they sold it to the Knights of Pythias, who decided to complete it as an office building and renamed it the Pythian Building.