| Attilio Demaría | |
| Fullname: | Atilio José Demaría |
| Birth Date: | 19 March 1909 |
| Birth Place: | Buenos Aires, Argentina |
| Death Place: | Haedo, Argentina |
| Position: | Striker |
| Years1: | 1926–1931 |
| Years2: | 1931 |
| Years3: | 1931–1936 |
| Years4: | 1936 |
| Years5: | 1937-1938 |
| Years6: | 1938–1943 |
| Years7: | 1943–1944 |
| Years8: | 1944–1946 |
| Years9: | 1946–1948 |
| Clubs1: | Estudiantil Porteño |
| Clubs2: | Gimnasia La Plata |
| Clubs3: | Ambrosiana-Inter |
| Clubs4: | Independiente |
| Clubs5: | Estudiantil Porteño |
| Clubs6: | Ambrosiana-Inter |
| Clubs7: | Novara |
| Clubs8: | Legnano |
| Clubs9: | Cosenza |
| Caps1: | 108 |
| Caps2: | 1 |
| Caps3: | 155 |
| Caps4: | 3 |
| Caps5: | 21 |
| Caps6: | 113 |
| Caps7: | 16 |
| Caps8: | 16 |
| Caps9: | 44 |
| Goals1: | 37 |
| Goals2: | 0 |
| Goals3: | 50 |
| Goals4: | 1 |
| Goals5: | 14 |
| Goals6: | 26 |
| Goals7: | 5 |
| Goals8: | 5 |
| Goals9: | 0 |
| Totalcaps: | 377 |
| Totalgoals: | 138 |
| Nationalyears1: | 1930–1931 |
| Nationalyears2: | 1932–1940 |
| Nationalteam1: | Argentina |
| Nationalteam2: | Italy |
| Nationalcaps1: | 3 |
| Nationalcaps2: | 13 |
| Nationalgoals1: | 0 |
| Nationalgoals2: | 3 |
| Manageryears1: | 1945–1946 |
| Managerclubs1: | Legnano |
| Manageryears2: | 1946–1948 |
| Managerclubs2: | Cosenza |
| Manageryears3: | 1951 |
| Managerclubs3: | Gimnasia La Plata |
| Manageryears4: | 1965 |
| Managerclubs4: | Sportivo Italiano |
| Manageryears5: | 1973 |
| Managerclubs5: | Almirante Brown |
Atilio José Demaría (pronounced as /es/; 19 March 1909 – 11 November 1990), Italianized as Attilio Demaria (pronounced as /it/), was an Italian Argentine footballer, who played as a striker. He played club football in Argentina and Italy. At international level, he represented Argentina in the 1930 World Cup and Italy in the 1934 World Cup, reaching the finals of both tournaments and winning the latter edition of the competition.
Demaría was born in Buenos Aires. After starting his career in Argentina, he played 295 games for Internazionale of Italy between 1931 and 1943, scoring 86 goals for the club, also serving as the team's captain between 1940 and 1943.
Demaría also played for Gimnasia de La Plata, Estudiantil Porteño and Club Atlético Independiente in Argentina and Novara, Legnano and Cosenza in Italy.
Demaría represented the Argentina national team on three occasions between 1930 and 1931, and took part in the 1930 World Cup, winning a runners-up medal. He was later also a member of the Italy squad that won the 1934 World Cup on home soil as well as the squad that won the 1933–35 Central European International Cup; in total, he made thirteen appearances for Italy between 1932 and 1940, scoring three goals.
His younger brother Félix Demaría also played football professionally, including a season for Ambrosiana-Inter. To distinguish them, Attilio was referred to as Demaría I and Félix as Demaría II. Attilio Demaría died in Haedo, Buenos Aires on 11 November 1990.
Ambrosiana-Inter
Argentina
Runner-up 1930