The 1915–16 National Challenge Cup was the third tournament of the modern-day Lamar Hunt U.S. Open Cup. Bethlehem Steel won its second consecutive championship. The entries for the competition were to be made by midnight September 30, 1915. The draw for the qualifying and first rounds was made on October 2, 1915. The tournament schedule was originally set for the qualifying round to take place on or before October 24; first round, November 14; second round, December 12; third round, January 16, 1916; fourth round, March 5; semis, April 2, and final on April 30.
 Dewar Challenge Cup | |
| Tournament details | |
|---|---|
| Country | United States |
| Defending champions | Bethlehem Steel |
| Final positions | |
| Champions | Bethlehem Steel (2nd title) |
| Runner-up | Fall River Rovers |
Bracket
editHome teams listed on top of bracket
a) aggregate after 3 games
b) forfeit replay
Final
edit| Bethlehem Steel (PA) | 1–0 | Fall River Rovers (MA) |
|---|---|---|
Fleming  78' (pen.) |
Report |
Bill Duncan
Sam Fletcher
Jock Ferguson- Thomas Murray
- James Campbell
- Bob Morrison (c)
- Samuel MacDonald
- Fred Pepper
- Neil Clarke
Paddy Butler- Tommy Fleming
- Manager: Horace Lewis
- Chick Albion
- Frank Booth
- Charles Burns
- Frederick Burns
- Pierre Bouchard
- William Stone
- Arthur Morgan
- John Sullivan
- John Dalton
- Thomas Swords (c)
- Oliva Garant
- Manager: Randolph Howarth
