| National Challenge Cup | |
| Year: | 1919–20 |
| Country: | United States |
| Dates: | December 24, 1919 – May 9, 1920 |
| Defending Champions: | Bethlehem Steel |
| Winners: | Ben Millers |
| Count: | 1 |
| Second: | Fore River |
| Semifinal1: | Robins Dry Dock |
| Semifinal2: | Packard F.C. |
| Prev Season: | 1919 |
| Next Season: | 1921 |
The 1919–20 National Challenge Cup was the annual open cup held by the United States Football Association now known as the Lamar Hunt U.S. Open Cup. This edition featured 99 teams in two divisions. The western division had 41 teams in six districts while the eastern division had 58 teams also divided into six districts. The draw for the first round took place on October 13, 1919, in New York.
Home teams listed on top of bracket
(*): replay after tied match
w/o: walkover/forfeit victory awarded