The 2004 Pacific League Playoffs was a set of consecutive playoff series for the Pacific League of Nippon Professional Baseball (NPB) in the season. It began on October 1 and ended on October 11, with the top-three finishers of the PL participating in two series of games, with the first stage being a best-of-three series and the final stage being a best-of-five series. They were:
With the victory against the Hawks, the Lions advanced to the Japan Series. The Pacific League would be the only league with a playoff until 2007, which saw both the Central and Pacific have their top three teams compete in a playoff that is referred to as the Climax Series.