The 1945 Chicago Cubs season was the 74th season of the Chicago Cubs franchise, the 70th in the National League and the 30th at Wrigley Field. The Cubs won the National League pennant with a record of 98–56, 3 games ahead of the second-place St. Louis Cardinals. The team went on to the 1945 World Series, which they lost to the Detroit Tigers in seven games. This was the Cubs last postseason appearance until 1984. It would take 71 years before the Cubs made it to another World Series.