In American football and Canadian football, a quarterback kneel, also called taking a knee, genuflect offense, kneel-down offense, or victory formation, occurs when the quarterback touches a knee to the ground immediately after receiving the snap, thus downing himself and ending the play. It is primarily used to run the clock down, either at the end of the first half (regardless of which team is ahead) or the game itself, to preserve a lead. Although it generally results in a loss of some yardage and uses up a down, it minimizes the risk of a fumble, which would give the other team a chance at recovering the ball.

The play is meant to keep the defense from seriously challenging for possession of the ball. The rules penalize rough play after the ball is dead, which in this play usually occurs a fraction of a second after the snap. Especially when the outcome of the game is all but certain, defenses will often give little resistance to the play as a matter of sportsmanship as well as to reduce the risk of injuries, penalties, and possible supplemental discipline (Referees and leagues have in recent years given increasingly severe penalties for unnecessary roughness inflicted on quarterbacks, as well as headshots in general). The quarterback is generally not touched.

The formation offers maximum protection against a fumble; should the center-quarterback exchange result in a fumble, a running back is lined up on either side of the quarterback, both to recover any fumble and protect the vulnerable kneeling player from being injured by defensive players who get through the line. Also, a player known as the "safety valve" is lined up directly behind the quarterback, often much farther than a typical tailback would line up. This player's responsibility is to tackle any defensive player who may recover a fumble and attempt to advance it. Because of this essentially "defensive" responsibility, the tailback in this formation may actually be a free safety or other defensive player who is adept at making tackles in the open field.

Even though the play itself takes very little time, the rules of American football dictate that it does not stop the game clock (as with any play where the ball carrier is tackled in bounds). With the 40-second play clock in the NFL and NCAA, along with the two-minute warning in the NFL, a team can run off over two minutes with three straight kneel-downs if the defensive team has no more timeouts. The winning team can storm the field if up to 40 seconds remains in the game (25 in XFL or 35 in USFL). In such situations, even before the game is technically over (i.e. the game clock will still be running), it is common for opposing coaches, team staff and players (including those not on the field for the final play) to shake hands with each other, and for media and other accredited persons to come onto the field as well to commence interviews. In the XFL, as many as three straight "victory formations" from 75 seconds (or in USFL, 1:45) left in regulation can be done.

The kneeldown is often called a "victory formation", as it is most often run by a winning team late in the game in order to preserve a victory. In the case of a close game, the winning team would be trying to avoid a turnover which might be the result of a more complex play. In the case of a more lopsided contest where the winning team's overall point differential has no prospect of affecting their playoff qualification prospects, the play can be run as a matter of sportsmanship (the winning team forgoing the opportunity to run up the score) and to avoid injuries and/or penalties. In terms of statistics, a kneel by the quarterback is typically recorded as a rushing attempt for −1 or −2 yards.

Other sports also use the term "victory formation" for a play designed only to run down the clock with little chance of injury, such as a jammer in roller derby skating behind or only lightly challenging the pack while the final seconds of the bout tick down.