|1921 Toronto Argonauts season|
|Head Coach||Sinc McEvenue|
|Home Field||Varsity Stadium|
|Playoff Finish||Won 9th Grey Cup|
|Previous season||Next season|
The 1921 Toronto Argonauts season was the 35th season for the team since the franchise's inception in 1873. The team finished in first place in the Interprovincial Rugby Football Union with a perfect 6–0–0 record and qualified for the playoffs for the second consecutive season. The Argonauts defeated the defending champion Toronto Varsity Blues in the Eastern Semi-Final before winning the Eastern Final over the Toronto Parkdale Canoe Club. The Argonauts faced the Edmonton Eskimos in the 9th Grey Cup game, which was the first time that a Western Canada Rugby Football Union team competed for the Cup. The Argonauts completed their first and only perfect season and won the franchise's second Grey Cup championship by a score of 23-0 in the first ever shut out in a Grey Cup game.
|Ottawa Rough Riders||6||3||3||0||77||71||6|
|1||Oct 1||Hamilton Tigers||Varsity Stadium||W 27–4||1–0–0|
|2||Oct 8||@ Montreal AAA Winged Wheelers||Percival Molson Memorial Stadium||W 40–5||2–0–0|
|3||Oct 15||Montreal AAA Winged Wheelers||Varsity Stadium||W 42–0||3–0–0|
|4||Oct 22||@ Hamilton Tigers||Civic Stadium||W 19–18||4–0–0|
|5||Oct 29||@ Ottawa Rough Riders||Lansdowne Park||W 11–3||5–0–0|
|6||Nov 12||Ottawa Rough Riders||Varsity Stadium||W 28–5||6–0–0|
|Eastern Semi-Final||Nov 19||Toronto Varsity Blues||Varsity Stadium||W 20–12|
|Eastern Final||Nov 26||Toronto Parkdale Canoe Club||Varsity Stadium||W 16–8|
|Grey Cup||Dec 3||Edmonton Eskimos||Varsity Stadium||W 23–0|
- "All-Time Coaching". Toronto Argonauts. http://www.argonauts.ca/page/all-time-coaching. Retrieved 2012-04-18.
- "Toronto Argonauts Stadium History". Toronto Argonauts. http://www.argonauts.ca/page/stadium-history. Retrieved 2012-04-18.
- 2009 Canadian Football League Facts, Figures & Records, Canadian Football League Properties/Publications, Toronto, Ontario, ISBN 978-0-9739425-4-5, p.294
- "1921 Links". cflapedia.com. http://cflapedia.com/Years/1921links.htm. Retrieved 2012-04-18.
- "Ottawa Rough Riders All-Time Scores". Capital Region Football. http://capitalregionfootball.info/index.php?pr=Rider_Game_Results. Retrieved 2012-04-18.
- "1921 Grey Cup Recap". Canadian Football League. http://cfl.ca/page/his_greycup_recap1921. Retrieved 2012-04-18.