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 International Federation of American Football (IFAF) selected Israel to host the Flag Football World Championships for 2021. The Kraft Family Sports Campus in Jerusalem was originally scheduled to stage the men's and women's events, but due to expected high winds the games were played at Teddy Stadium.
After the group ballot, 21 teams were divided into three groups of 5 and one group of 6. In the group stage each team played each other once, while the second stage of the event included play-offs and placement matches.
The two best teams of each group advanced to the quarter-finals.
The top seven teams, not including the United States, qualified for the 2022 World Games.