| 2003 NPB season | |
|---|---|
| League | Nippon Professional Baseball |
| Sport | Baseball |
| Duration | March 28 – October 27, 2003 |
| Regular Season | |
| Season MVP | CL: Kei Igawa (HAN) PL: Kenji Johjima (DAI) |
| League Postseason | |
| CL champions | Hanshin Tigers |
| CL runners-up | Chunichi Dragons |
| PL champions | Fukuoka Daiei Hawks |
| PL runners-up | Seibu Lions |
| Japan Series | |
| Champions | Fukuoka Daiei Hawks |
| Runners-up | Hanshin Tigers |
| Finals MVP | Toshiya Sugiuchi (DAI) |
The 2003 Nippon Professional Baseball season ended with the Daiei Hawks defeating the Hanshin Tigers in the 2003 Japan Series 4 games to 3.