| 1990 NPB season | |
|---|---|
| League | Nippon Professional Baseball |
| Sport | Baseball |
| Regular Season | |
| Season MVP | CL: Masaki Saito (YOM) PL: Hideo Nomo (KIN) |
| League Postseason | |
| CL champions | Yomiuri Giants |
| CL runners-up | Hiroshima Toyo Carp |
| PL champions | Seibu Lions |
| PL runners-up | Orix Braves |
| Japan Series | |
| Champions | Seibu Lions |
| Runners-up | Yomiuri Giants |
| Finals MVP | Orestes Destrade (SEI) |
The 1990 Nippon Professional Baseball season was the 41st season of operation for the league.