1971 Major League Baseball postseason

The 1971 Major League Baseball postseason was the playoff tournament of Major League Baseball for the 1971 season. The winners of each division advance to the postseason and face each other in a League Championship Series to determine the pennant winners that face each other in the World Series.

In the American League, the Baltimore Orioles were making their third straight postseason appearance, and the Oakland Athletics made their first postseason appearance since the 1931 World Series, when the team was still based out of Philadelphia. This was the first of five consecutive postseason appearances for the Athletics from 1971 to 1975.

In the National League, the Pittsburgh Pirates made their second straight postseason appearance. Joining them were the San Francisco Giants, who made their first postseason appearance since the 1962 World Series. This marked the first time that both teams from the San Francisco Bay Area made the postseason.

The playoffs began on October 2, 1971, and concluded on October 17, 1971, with the Pittsburgh Pirates defeating the Baltimore Orioles in seven games in the 1971 World Series. It was the Pirates' fourth championship in franchise history.