The 1946 National League tie-breaker series was a best-of-three playoff series that extended Major League Baseball's (MLB) 1946 regular season to decide the winner of the National League (NL) pennant. The games were played on October 1 and October 3, 1946, between the St. Louis Cardinals and Brooklyn Dodgers. It was necessary after both teams finished the season with identical win–loss records of 96–58. This was the first ever tie-breaker series in MLB history. The Cardinals won the regular season series, 16–8.