The 1983 Nippon Professional Baseball season was the 34th season of operation for the league. The Pacific League changed their playoff system for the season, which would see the first-place team play the second-place team in a playoff if they finished within five games of each other. The system, which never ended up being used in three straight seasons, was discontinued in 1985.
Seibu Lions won the series 4âÂÂ3.