Most Blocks in NBA History

Hakeem Olajuwon holds the NBA record for the most career blocks, with 3,830 recorded over 18 seasons from 1984 to 2002. He is the only player ever to top 3,500, finishing more than 500 blocks clear of second-place Dikembe Mutombo.

The blocked shot is defense at its most emphatic, the moment a big man rejects an attempt at the rim and turns it into a stop. The all-time leaderboard, though, only tells part of the story, because the NBA did not track blocks until the 1973-74 season. Here is the full leaderboard of the league’s greatest shot-blockers, the milestones behind them, and the history the record book leaves out. All figures are as of the 2025 season.

The record holder: Hakeem Olajuwon and 3,830 blocks

Olajuwon, nicknamed “The Dream,” combined the footwork of a guard with the timing of an elite rim protector, and he built his record almost entirely with the Houston Rockets. He averaged 3.1 blocks per game and remains the only player ever to post more than 200 blocks and 200 steals in a single season, a testament to his all-around defense.

That versatility set him apart. Many great shot-blockers are anchored near the basket, but Olajuwon could guard on the perimeter and still finish among the league leaders in rejections, which is how he compiled a total no one has approached.

The full leaderboard of career blocks leaders

The table below ranks the NBA’s all-time career blocks leaders since blocks became official in 1973-74.

Rank	Blocks	Player	Career
1	3,830	Hakeem Olajuwon	1984-2002
2	3,289	Dikembe Mutombo	1991-2009
3	3,189	Kareem Abdul-Jabbar	1969-1989
4	3,064	Mark Eaton	1982-1993
5	3,020	Tim Duncan	1997-2016
6	2,954	David Robinson	1989-2003
7	2,894	Patrick Ewing	1985-2000
8	2,732	Shaquille O’Neal	1992-2011
9	2,542	Tree Rollins	1977-1995
10	2,361	Robert Parish	1976-1997

Kareem Abdul-Jabbar’s total counts only from 1973-74 onward, since blocks were not recorded during his first four seasons. The list is a gallery of dominant centers from the 1980s and 1990s, the era when shot-blocking totals peaked.

Dikembe Mutombo and the great rim protectors

Dikembe Mutombo, famous for his finger-wag after a rejection, sits second with 3,289 blocks and won the Defensive Player of the Year award four times. Behind him, Mark Eaton and David Robinson round out a group of centers who anchored elite defenses for years. Every player in the top 10 stood at least 6-foot-9, underscoring how central size is to the record.

The missing giants: Chamberlain and Russell

The most important names absent from the list are Wilt Chamberlain and Bill Russell, whose careers ended before official tracking began. Both were legendary shot-blockers, and unofficial accounts suggest their totals would rank among the highest ever, but none of their rejections count toward the record. They dominate the most rebounds in NBA history leaderboard instead, where the statistic was recorded throughout their careers.

Why the record matters

Blocks measure rim protection, the backbone of great team defense, and reaching 3,830 demands both elite instincts and rare longevity. Olajuwon’s mark reflects nearly two decades as one of the game’s premier defenders, and its margin over the field makes it hard to threaten. The best two-way big men also fill other pages of the record book, from the most assists in NBA history to the most points in NBA history, and the award their play often earns appears on our youngest NBA MVP leaderboard.

The short version: Hakeem Olajuwon holds the NBA career blocks record with 3,830, the only player above 3,500, ahead of Dikembe Mutombo (3,289). Because blocks became official only in 1973-74, Chamberlain and Russell are absent. As of the 2025 season, Olajuwon’s record still stands untouched.