| 1921 Dayton Triangles season | |
|---|---|
| Head coach | Bud Talbott |
| Home field | Triangle Park |
| Results | |
| Record | 4–4–1 |
| League place | 8th APFA |
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.