| National Challenge Cup | |
| Year: | 1939 |
| Country: | United States |
| Dates: | December 11, 1938 – May 7, 1939 |
| Defending Champions: | Sparta Garden City |
| Winners: | Brooklyn St. Mary's Celtic |
| Count: | 1 |
| Second: | Manhattan Beer (IL) |
| Semifinal1: | Morgan Sports Club |
| Semifinal2: | German American SC |
| Prev Season: | 1938 |
| Next Season: | 1940 |
The 1939 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.
a) aggregate after 3 games