The most slam dunks title holder goes to Dwight Howard in the NBA. He still holds the record since 1996. It cannot be denied with his height of 6'11". Currently, the total slam dunks he did is 2950.
The record for most 'slam dunks' in the NBA is held by Dwight Howard, who has recorded 1,857 slam dunks in his career. He is followed by LeBron James with 1,845 and DeAndre Jordan with 1,739.