| Year: | 2012 |
| Stage1champion: | Fukuoka SoftBank Hawks (2) |
| Stage1champion Games: | 67–65–12 (.508), 6.5 GB |
| Stage1runnerup: | Saitama Seibu Lions (1) |
| Stage1runnerup Games: | 72–63–9 (.533), 3 GB |
| Date1: | October 13–15 |
| Stage2champion: | Hokkaido Nippon-Ham Fighters (4) |
| Stage2champion Games: | 74–59–11 (.556), 3 GA |
| Stage2runnerup: | Fukuoka SoftBank Hawks (0) |
| Stage2runnerup Manager: | Koji Akiyama |
| Stage2runnerup Games: | 67–65–12 (.508), 6.5 GB |
| Date2: | October 17–19 |
| Mvp: | Yoshio Itoi (Nippon-Ham) |
| Previous Series: | 2011 Pacific League Climax Series |
| Previous Year: | 2011 |
| Next Series: | 2013 Pacific League Climax Series |
| Next Year: | 2013 |
The 2012 Pacific League Climax Series (PLCS) consisted of two consecutive series, Stage 1 being a best-of-three series and Stage 2 being a best-of-six with the top seed being awarded a one-win advantage. The winner of the series advanced to the 2012 Japan Series, where they competed against the 2012 Central League Climax Series winner. The top three regular-season finishers played in the two series. The PLCS began on with the first game of Stage 1 on October 13 and ended with the final game of Stage 2 on October 19.