Nelson Walter "Fogata" Demarco Riccardi (6 February 1925 – 21 July 2009) was a basketball player from Uruguay, who competed in three Olympics. At the 1948 Summer Olympics, Demarco and team Uruguay placed 5th in the Olympics. Demarco won a bronze medal at both the 1952 Summer Olympics and the 1956 Summer Olympics.
His remains are buried at Cementerio del Norte, Montevideo.