List of National Basketball Association annual blocks leaders

In basketball, a block (short for blocked shot) occurs when a defender deflects or stops a field goal attempt without committing a foul. The National Basketball Association's (NBA) block title is awarded to the player with the highest blocks per game average in a given season. The block title was first recognized in the 1973–74 season when statistics on blocks were first compiled. To qualify for the blocks title, the player must appear in at least 70 games (out of 82) or have at least 100 blocks. This is the requirement since the 1974–75 season, with requirements changing with the schedule length several times before that.

Mark Eaton holds the all-time records for total blocks (456) and blocks per game (5.56) in a season; both achieved in the 1984–85 season.Manute Bol holds the rookie records for total blocks and blocks per game when he had 397 and averaged 5.0 in the 1985–86 season. Among active players, Marcus Camby had the highest season block total (285) in the 2007–08 season and Serge Ibaka had the highest season block average (3.65) in the 2011–12 season.