| National Challenge Cup | |
| Year: | 1923-24 |
| Country: |  United States |
| Dates: | 1 December 1923- 30 March 1924 |
| Defending Champions: | Paterson F.C. |
| Winners: | Fall River F.C. |
| Count: | 1 |
| Second: | Vesper Buick |
| Semifinal1: | Bricklayers and Masons |
| Semifinal2: | Bethlehem Steel |
| Prev Season: | 1923 |
| Next Season: | 1925 |
The 1923–24 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.
The Fall River F.C. defeated Vesper Buicks of St. Louis by a score of 4–2. Recent film of the final was discovered showing the 36th minute handball by Alex Kemp of the 'Marksmen' which led to Vesper Buicks' first goal. This is also the first known game in which soccer players wore numbers.
Home teams listed on top of bracket
(*): replay after tied match
w/o: walkover/forfeit victory awarded