Flag football is a variant of gridiron football where, instead of tackling players to the ground, the defensive team must remove a flag or flag belt from the ball carrier ("deflagging") to end a down. In flag football, contact is limited between players. The sport has a strong amateur following with several national and international competitions each year sponsored by various associations but is most popularly played in America where it was invented. The international governing body for the sport is the International Federation of American Football (IFAF). In 2022, flag football was shortlisted as a proposed discretionary event for the 2028 Summer Olympics in Los Angeles, with inclusion being accepted on October 16, 2023.

American football, also known as gridiron football, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with possession of the oval-shaped football, attempts to advance down the field by running with the ball or throwing it, while the defense, the team without possession of the ball, aims to stop the offense's advance and to take control of the ball for themselves. The offense must advance at least ten yards in four downs or plays; if they fail, they turn over the football to the defense, but if they succeed, they are given a new set of four downs to continue the drive. A game is won by the team with the higher number of points, which are scored primarily by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal.