| William Demko | |
| Full Name: | William Jacob Demko |
| Birth Date: | December 20, 1895 |
| Birth Place: | Philadelphia, Pennsylvania |
| Death Place: | Philadelphia, Pennsylvania |
| Years1: | 1923–1924 |
| Clubs1: | Philadelphia Fleischer Yarn |
| Nationalyears1: | 1924 |
| Nationalteam1: | United States MNT |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
William Jacob Demko (December 20, 1895 - August 8, 1957) was a U.S. soccer defender who was a member of the U.S. soccer team at the 1924 Summer Olympics. Demko earned two cap with the U.S. national team in 1924. While Demko was a member of the U.S. team at the Olympics, he did not play in the two U.S. games.[1] However, following the tournament, the U.S. had two exhibition games. Demko played in both, a win over Poland and a loss to Ireland.[2]
He was born in Philadelphia, Pennsylvania.