| Team: | Dayton Triangles |
| Year: | 1921 |
| Record: | 4–4–1 |
| League Place: | 8th APFA |
| Coach: | Bud Talbott |
| Stadium: | Triangle Park |
The 1921 Dayton Triangles season was their second completed in the young American Professional Football Association (APFA). The team failed to improve on their previous output of 5–2–2, winning only four games.[1] They finished eighth in the league.
| Week | Date | Opponent | Result | |
|---|---|---|---|---|
| 1 | October 2, 1921 | Columbus Panhandles | W 42–13 | |
| 2 | October 9, 1921 | at Detroit Tigers | L 10–7 | |
| 3 | October 16, 1921 | Canton Bulldogs | T 14–14 | |
| 4 | October 23, 1921 | at Chicago Staleys | L 7–0 | |
| 5 | October 30, 1921 | Cleveland Indians | W 3–2 | |
| 6 | November 6, 1921 | at Canton Bulldogs | L 14–0 | |
| 7 | November 13, 1921 | Detroit Tigers | W 27–0 | |
| 8 | November 20, 1921 | Akron Pros | W 3–0 | |
| 9 | November 27, 1921 | at Buffalo All-Americans | L 7–0 |