Football Manager 2021 (officially abbreviated as FM21) is a football-management simulation video game developed by Sports Interactive and published by Sega. It was released worldwide for iOS, Android, macOS and Windows on 24 November 2020.

FM21's headline features cover a number of key areas of the game including the interaction system, matchday experience and the recruitment module. There are new communication methods, including gestures, and new interaction options between the manager, their players and the media. There are new presentation elements before, during and after a match and an overhaul to the match engine AI. Expected goals (or xG) makes its debut in the series as part of a wider suite of data analysis changes through an xG model, built by Sports Interactive in partnership with SciSports. Trophy presentations have been revamped too.

117 leagues from 52 nations across five continents: Africa, Asia (including Australia), Europe, North America and South America. Coverage is heavily slanted towards European teams, with 34 of its 51 constituent countries having playable leagues, while South Africa is the only country of Africa's total 54 that is covered.

Football Manager 2021 is the most accomplished series entry in years. It's more accessible than ever, there are countless quality-of-life changes that make this iteration feel like a serious breath of fresh air for devotees, and the match engine is the best it's ever been.