1997 Major League Baseball postseason

The 1997 Major League Baseball postseason was the playoff tournament of Major League Baseball for the 1997 season. The winners of the League Division Series would move on to the League Championship Series to determine the pennant winners that face each other in the World Series. This was the last edition of the postseason in which teams were not seeded by their win-loss record.

In the American League, the New York Yankees and Cleveland Indians returned to the postseason for the third year in a row, the Baltimore Orioles returned to the postseason for the second straight year (which would be their last until 2012), and the Seattle Mariners returned to the postseason for the second time in three years.

In the National League, the Atlanta Braves made their sixth straight postseason appearance, the Houston Astros made their first postseason appearance since 1986, the Florida Marlins made their first postseason appearance four years into their existence, and the San Francisco Giants returned to the postseason for the first time since 1989.

The postseason began on September 30, 1997, and ended on October 26, 1997, with the Marlins defeating the Indians in seven games in the 1997 World Series. It was the Marlins' first championship in franchise history.