Attilio Demaria (March 19, 1909 – November 11, 1990) is a former Italian-Argentine footballer player, who played for Argentina in the 1930 World Cup and for Italy in the 1934 World Cup.
He was born in Buenos Aires. He played 295 games for Internazionale of Italy between 1931 and 1943, scoring 86 goals for the club.
Demaria also played for Gimnasia de La Plata, Estudantil Porteno and Club Atletico Independiente in Argentina and Novara, Legnano and Cosenza in Italy
Demaria died in Haedo, Buenos Aires on November 11 1990.