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.
Regular season
Standings
Schedule
| Week | Date | Opponent | Result | Record |
| 1 | Oct 1 | at Montreal AAA | W 20–5 | 1–0 |
| 2 | Oct 8 | vs. Hamilton Tigers | W 19–6 | 2–0 |
| 3 | Oct 15 | at Hamilton Tigers | L 13–15 | 2–1 |
| 4 | Oct 22 | vs. Montreal AAA | W 28–7 | 3–1 |
| 5 | Oct 29 | vs. Toronto Argonauts | L 3–11 | 3–2 |
| 6 | Bye |
| 7 | Nov 12 | at Toronto Argonauts | L 5–28 | 3–3 |
[2]
References
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| Franchise | |
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| Stadiums | |
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| Lore | |
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| Important figures | |
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| Retired numbers | |
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Dominion Championships (3) | |
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Grey Cup Championships (9) | |
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Eastern Division Championships (15) | |
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| See also | |
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