| 1989 NPB season | |
|---|---|
| League | Nippon Professional Baseball |
| Sport | Baseball |
| Regular Season | |
| Season MVP | CL: Warren Cromartie (YOM) PL: Ralph Bryant (KIN) |
| League Postseason | |
| CL champions | Yomiuri Giants |
| CL runners-up | Hiroshima Toyo Carp |
| PL champions | Kintetsu Buffaloes |
| PL runners-up | Orix Braves |
| Japan Series | |
| Champions | Yomiuri Giants |
| Runners-up | Kintetsu Buffaloes |
| Finals MVP | Norihiro Komada (YOM) |
The 1989 Nippon Professional Baseball season was the 40th season of operation for the league.