Goaltending is a violation of the rules in the sport of basketball. It consists of certain forms of player interference with the ball while it is on its way to the basket. It is goaltending if a player touches the ball when it is (a) in downward flight; or (b) above the basket rim and within an imaginary cylinder projecting above the rim; or (c) already touching the rim; or after it has touched the backboard and has a chance of going in the hoop.

In basketball, a block or blocked shot occurs when a defensive player legally deflects a field goal attempt from an offensive player to prevent a score. The defender is not allowed to make contact with the offensive player's hand or a foul is called. In order to be legal, the block must occur while the shot is traveling upward or at its apex. A deflected field goal that is made does not count as a blocked shot and simply counts as a successful field goal attempt for shooter plus the points awarded to the shooting team. For the shooter, a blocked shot is counted as a missed field goal attempt. Also, on a shooting foul, a blocked shot cannot be awarded or counted, even if the player who deflected the field goal attempt is different from the player who committed the foul. If the ball is heading downward when the defender hits it, it is ruled as goaltending and counts as a made basket. Goaltending is also called if the block is made after the ball bounces on the backboard.