Edoardo Mariani (Italian pronunciation: [edoˈardo maˈrjaːni]; 5 March 1893 – 7 January 1956) was an Italian footballer who played as a left winger.^[1]

Mariani made four appearances for Italy, all of which came in 1912. He became the youngest forward to start a match for Italy, when he made his debut against France, starting in a 3–4 friendly loss in Turin on 17 March 1912, at the age of 19 years and 12 days.^[2][3][4] This record was later bettered by Leopoldo Conti, who made his international debut on 28 March 1920, starting in a 3–0 friendly away loss to Switzerland, at the age of 18 years, 351 days.^[2][5][6] Mariani is either the third or fourth-youngest player ever to start a match for Italy, behind only Conti, Eugenio Mosso, and possibly Rodolfo Gavinelli. Mosso made his only international appearance for Italy on 5 April 1914, starting in a 1–1 friendly away draw against Switzerland, at the age of 18 years, 238 days.^[2][7][8][9] Gavinelli, on the other hand, made his only international appearance for Italy on 9 April 1911, starting in a 2–2 friendly away draw against France, at the age of either 20 years, 98 days, or 16 years, 98 days, as it is not known officially whether he was born on 1 January in 1891 or 1895.^{[2][10][11][12]} He later competed for Italy in the men's football tournament at the 1912 Summer Olympics.^[13] Mariani made 3 appearances for Italy at the 1912 Summer Olympics, including his final international appearance, which came in a 5–1 defeat to Austria on 3 July.