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In Major League Baseball, a shutout (denoted statistically as ShO or SHO) refers to the act by which a single pitcher pitches a complete game and does not allow the opposing team to score a run.  If two or more pitchers combine to complete this act, no pitcher will be awarded a shutout, although the team itself can be said to have "shut out" the opposing team. The only exception to this is when a pitcher enters a game before the opposing team scores a run or makes an out and then completes the game without allowing a run to score. That pitcher is then awarded a shutout, although not a complete game.

The all-time career leader in shutouts is Walter Johnson, who pitched for the Washington Senators from 1907 to 1927.  He accumulated 110 shutouts, which is 20 more than second placed Grover Cleveland Alexander.  The most shutouts recorded in one season was 16, which was a feat accomplished by both Grover Alexander (1916) and George Bradley (1876).  These records are considered among the most secure records in baseball, as pitchers today rarely earn more than one or two shutouts per season with a heavy emphasis on pitch count and relief pitching.  Complete games themselves have also become rare among starting pitchers.  As of 2021, the current active leader in shutouts is Clayton Kershaw of the Los Angeles Dodgers, whose 15 shutouts ties him for 463rd all time. Only four pitchers whose entire careers were in the post-1920 live-ball era threw as many as 60 career shutouts, with Warren Spahn leading those pitchers with 63.