Albert Richard "Whitey" Michelsen (December 16, 1893 – July 7, 1964) was an American long-distance runner who is recognized as having set a world's best in the marathon on October 12, 1925, with a time of 2:29:01 at the inaugural Port Chester Marathon in Port Chester, New York. According to the International Association of Athletics Federations, Michelsen held this record until Fusashige Suzuki posted a 2:27:49 performance in Tokyo, Japan on March 31, 1935. Michelsen again won the Portchester Marathon in 1927. Around that time, he was a plumber from Stamford, Connecticut.