 Dewar Challenge Cup | |
| Tournament details | |
|---|---|
| Country |  USA |
| Dates | 16 January- 24 April 1938 |
| Defending champions | New York Americans |
| Final positions | |
| Champions | Sparta Garden City (1st title) |
| Runner-up | St. Mary's Celtic |
| Semifinalists |
|
The 1938 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. Scheduled as follows: First Round on or before January 16, Second Round on or before January 30, Quarterfinals February 13, Semifinals East February 26, 27, West February 20, 27.