Mark Edward Eaton was an American professional basketball player who spent his entire career (1982–1993) with the Utah Jazz of the National Basketball Association (NBA). Named an NBA All-Star in 1989, he was twice voted the NBA Defensive Player of the Year and was a five-time member of the NBA All-Defensive Team. The 7-foot-4-inch (2.24 m) Eaton became one of the best defensive centers in NBA history. He led the league in blocks four times and holds the NBA single-season records for blocks (456) and blocked shots per game average (5.6), as well as career blocked shots per game (3.5). His No. 53 was retired by the Jazz.

The NBA Defensive Player of the Year Award is an annual National Basketball Association (NBA) award given since the 1982–83 NBA season to the best defensive player of the regular season. The winner is selected by a panel of 124 sportswriters and broadcasters throughout the United States and Canada, each of whom casts a vote for first, second and third place selections. Each first-place vote is worth five points, second-place votes are worth three points, and a third-place vote is worth one. The player with the highest point total, regardless of the number of first-place votes, wins the award. Since the 2022–23 NBA season, winners receive the Hakeem Olajuwon Trophy, named after the two-time defensive player of the year winner.