The 2019 Pacific League Climax Series (PLCS) was a post-season Climax Series playoff consisting of two consecutive series that determined which of the three teams who finished in the top three during the 2019 regular season would represent the Pacific League in the Japan Series. The First Stage was a best-of-three series played between the second-place hosts Fukuoka SoftBank Hawks and the third-place Tohoku Rakuten Golden Eagles. The series was played between October 5 to 7. The Hawks defeated the Eagles 2–1 and advanced to the Final Stage to face the pennant-winning Saitama Seibu Lions.
The Final Stage was a best-of-six series hosted by the Lions. Having won the regular season, Seibu was awarded a one-win advantage over the Hawks. The series was played between October 9 to 13. SoftBank swept Seibu 4–1 in four games to advance to the 2019 Japan Series, where they competed against the 2019 Central League Climax Series winner, the Yomiuri Giants.
