| 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.
| Central League | G | W | L | T | Pct. | GB |
|---|---|---|---|---|---|---|
| Hanshin Tigers | 140 | 87 | 51 | 2 | .629 | -- |
| Chunichi Dragons | 140 | 73 | 66 | 1 | .525 | 14.5 |
| Yomiuri Giants | 140 | 71 | 66 | 3 | .518 | 15.5 |
| Yakult Swallows | 140 | 71 | 66 | 3 | .518 | 15.5 |
| Hiroshima Toyo Carp | 140 | 67 | 71 | 2 | .486 | 20.0 |
| Yokohama BayStars | 140 | 45 | 94 | 1 | .325 | 42.5 |
| Pacific League | G | W | L | T | Pct. | GB |
|---|---|---|---|---|---|---|
| Daiei Hawks | 140 | 82 | 55 | 3 | .596 | -- |
| Seibu Lions | 140 | 77 | 61 | 2 | .557 | 5.5 |
| Osaka Kintetsu Buffaloes | 140 | 74 | 64 | 2 | .536 | 8.5 |
| Chiba Lotte Marines | 140 | 68 | 69 | 3 | .496 | 14.0 |
| Nippon-Ham Fighters | 140 | 62 | 74 | 4 | .457 | 19.5 |
| Orix BlueWave | 140 | 48 | 88 | 4 | .357 | 33.5 |