The 2009 Taiwan Series was played by Uni-President 7-Eleven Lions and Brother Elephants, winners of the first and second half-seasons.

After seven games, the Lions defeated the Elephants four games to three and won the title.

All regular season rules apply with the following exceptions: October 17, 2009 at Tainan Municipal Baseball Stadium, Tainan City October 18, 2009 at Douliu Baseball Stadium, Douliu, Yunlin County October 20, 2009 at Chengcing Lake Baseball Field, Niaosong, Kaohsiung County October 21, 2009 at Taichung Intercontinental Baseball Stadium, Taichung City October 22, 2009 at Xinzhuang Baseball Stadium, Xinzhuang City, Taipei County October 24, 2009 at Tainan Municipal Baseball Stadium, Tainan City This game is the currently the longest game (17 innings) in CPBL's history.

October 25, 2009 at Tainan Municipal Baseball Stadium, Tainan City