William A. Muldoon (May 25, 1852 – June 3, 1933) was the Greco-Roman Wrestling Champion, physical culturist and the first chairman of the New York State Athletic Commission. He once wrestled a match that lasted over seven hours. Nicknamed "The Solid Man," Muldoon established himself as champion in Greco-Roman wrestling in the 1880s and over the years gained a remarkable measure of public influence that would continue through his days as a health farm proprietor in Westchester County and his service on NYSAC. Muldoon was a mainstay in New York sports for over 50 years.