1920–21 National Challenge Cup
Dewar Challenge Cup | |
| Tournament details | |
|---|---|
| Country | United States |
| Dates | 16 October 1920- 19 April 1921 |
| Defending champions | Ben Millers |
| Final positions | |
| Champions | Robins Dry Dock (1st title) |
| Runners-up | Scullin Steel |
| Semifinalists | |
The 1920–21 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.