| Competition: | J. League Division 2 |
| Season: | 2003 |
| Winners: | Albirex Niigata 1st J2 title 1st D2 title |
| Promoted: | Albirex Niigata Sanfrecce Hiroshima |
| League Topscorer: | Marcus (32 goals total) |
| Matches: | 264 |
| Total Goals: | 678 |
| Highest Attendance: | 42,223 (Round 44, Albirex vs. Ardija) |
| Lowest Attendance: | 1,337 (Round 4, HollyHock vs. Ardija) |
| Average Attendance: | 7,895 |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
The 2003 J. League Division 2 season was the 32nd season of the second-tier club football in Japan and the 5th season since the establishment of J2 League.
In this season, twelve clubs competed in the quadruple round-robin format. The top two received promotion to the J. League Division 1. There were no relegation to the third-tier Japan Football League.
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Following twelve clubs played in J. League Division 2 during 2003 season. Of these clubs, Consadole Sapporo and Sanfrecce Hiroshima were relegated from Division 1 last year.
Twelve clubs will play in quadruple round-robin format, a total of 44 games each. A club receives 3 points for a win, 1 point for a tie, and 0 points for a loss. The clubs are ranked by points, and tie breakers are, in the following order:
A draw would be conducted, if necessary. However, if two clubs are tied at the first place, both clubs will be declared as the champions. The top two clubs are promoted to J1.
