Baseball rules

Throughout the history of baseball, the rules have frequently changed as the game continues to evolve. A few common rules most professional leagues have in common is that four balls is a base on balls, three strikes is a strikeout, and three outs end a half-inning.

This article is about the rules of baseball. For the tort law rule governing liability for injuries to spectators from foul balls, see Baseball Rule.

Baseball evolved out of bat-and-ball games in the mid-19th century, and its modern rules are largely based on those first published in 1848. Most rule sets are generally based on the Official Baseball Rules (OBR) published by Major League Baseball (MLB), though various minor variations exist from league to league; the World Baseball Softball Confederation maintains its own official rule set for international competition.

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