1921 Rock Island Independents season
| 1921 Rock Island Independents season | |
|---|---|
| General manager | Walter Flanigan |
| Head coach | Frank Coughlin, Jimmy Conzelman |
| Home stadium | Douglas Park |
| Results | |
| Record | 4–2–1 APFA (5–2–1 overall) |
| League place | 5th in APFA |
The 1921 Rock Island Independents season was their second completed in the young American Professional Football Association (APFA), later rechristened the National Football League. The team failed to improve on their previous record against league opponents of 6–2–2, winning only four games. They finished fifth in the league.