2012 Nippon Professional Baseball season

The 2012 Nippon Professional Baseball season is the 63rd season since the NPB was reorganized in 1950.

Climax Series
''Note: All of the games that are played in the first two rounds of the Climax Series are held at the higher seed's home stadium. The team with the higher regular-season standing also advances if the round ends in a tie.''

First stage
The regular season league champions, the Hokkaido Nippon-Ham Fighters (PL) and the Yomiuri Giants (CL), received byes to the championship round.

Final stage
The regular season league champions, the Hokkaido Nippon-Ham Fighters (PL) and the Yomiuri Giants (CL), received a one-game advantage.