The 2021 Pittsburgh Pirates season was the franchise's 140th season overall, 135th season as a member of the National League, and 21st season at PNC Park. The Pirates suffered another heavily losing season, finishing last in the NL Central with a 0.377 winning percentage, the second-worst in the National League. They were 34 games behind the division-winning Brewers. One rare highlight from the season was winning a series of games against the playoff-bound Giants, including a 10-2 steamrolling of them at Oracle Park.