Mac William Otten (born December 16, 1925) was an American professional basketball player. Otten was selected in the third round in the 1949 BAA Draft by the Indianapolis Olympians. He played for the Tri-Cities Blackhawks in 1949–50 before being traded to the St. Louis Bombers that season. He ended his BAA/NBA career playing for the Bombers.Mac Otten is also the brother of Don Otten, another former NBA player.