| 1921 Ottawa Rough Riders season | |
|---|---|
| Head coach | Tom Clancy |
| Home field | Lansdowne Park |
| Results | |
| Record | 3–3 |
| League place | 2nd, IRFU |
| Playoff finish | Did not qualify |
The 1921 Ottawa Rough Riders finished in second place in the Interprovincial Rugby Football Union with a 3–3 record, but failed to qualify for the playoffs.