2021 ACF Regionals
The 2021 ACF Regionals took place online the weekend of January 30, 2021 at ten different sites throughout the United States, Canada, and the United Kingdom. Breaking with recent precedent, 2021 ACF Regionals was not used as a qualifier for 2021 ACF Nationals, due in large part to the online nature of the 2020-21 season. The tournament was edited by a large group of editors. Head editor Jaimie Carlson was joined by editors Annabelle Yang, Hari Parameswaran, Hasna Karim, Jonathan Tran, Jordan Brownstein, Michael Kearney, Natan Holtzman, Nick Dai, Nitin Rao, Stephen Eltinge, and Tim Morrison.
2021 ACF Regionals was notable for taking advantage of the online format to host a "supersite" mirror of the set. ACF invited the teams deemed to be the fourteen best teams to play at one "Invitational" site. Berkeley A, Cambridge A, Chicago A, Columbia A, Florida A, Harvard A, Illinois A, Maryland A, Minnesota A, MIT A, Ohio State A, Oxford A, Stanford A, and Texas A were invited to and played at the "supersite" mirror. ACF did not announce their criteria for determining the best teams, which led to some controversy surrounding the teams that were chosen, such as the omission of Brown A.
|Regional||Host||TD||Winner||Runner-Up||Individual High Scorer||Statistics|
|Invitational||ACF||Alex Damisch||Chicago A||Harvard A||Will Alston|||
|Southeast||Georgia Tech||Tejas Santanam||Vanderbilt A||Vanderbilt B||Sean Farrell|||
|Northeast||Yale||Daniel Sheinberg||Brown||Harvard B||Ryan Bilger|||
|South Central||Nebraska||Jackson Bartak||WUSTL A||Northwestern A||Charles Hang|||
|North||Minnesota||Tora Husar and Rob Carson||Chicago B||Chicago C||Jakob Boeye|||
|Upper Mid-Atlantic||NYU||Theresa Nyowheoma||Princeton A||Columbia B||Alex Schmidt|||
|United Kingdom||Imperial||Conor McMeel||Oxford A (Oxford A played at the Invitational site; the team designated Oxford A here was the traditional Oxford B)||Southampton A||Evan Lynch|||
|West||USC and UW||Alice Jiang, Amol Patil, and Kevin Kodama||UBC A||UC Davis||Nick Jensen|||
|Eastern Canada||Toronto||Joshua Lane||McGill||Toronto A||Ian Dewan|||
|High School||Independent||Nick Dai and Connor Rankin||Lambert||St. Mark's School of Texas||Aadi Karthik|||