The 2021 IFAF Men's Flag Football World Championships was the 10th World Championships in men's flag football.

The tournament took place in Jerusalem, Israel, from 6 to 8 December 2021.

Denmark was scheduled to host the 2020 edition only for it to be canceled due to the coronavirus pandemic.

The Kraft Family Sports Campus in Jerusalem was originally scheduled to stage the men's and women's events, however, due to expected high winds the games were played at Teddy Stadium.

Team Neutral Austria Belarus South Korea Panama Japan Italy  Switzerland Brazil Denmark Israel (hosts) Germany Slovakia Finland Mexico Thailand The top seven teams, not including the United States, qualified for the 2022 World Games.