The 2003 Formula Nippon Championship was contested over 10 races. 10 different teams and 21 different drivers competed in the series. All teams had to use Lola chassis (Lola B03/51) and Mugen Honda (Mugen MF308) engines.
| Team | # | Driver | Chassis | Engine | Rounds |
|---|---|---|---|---|---|
| PIAA Nakajima Racing | 1 | | Lola B03/51 | Mugen MF308 | All |
| 2 | | All | |||
| Olympic Kondo Racing Team | 3 | | Lola B03/51 | Mugen MF308 | All |
| 4 | | All | |||
| Team 5ZIGEN | 5 | | Lola B03/51 | Mugen MF308 | All |
| 6 | | 1–5 | |||
| | 7–10 | ||||
| Forum Engineering ARTA Team LeMans | 7 | | Lola B03/51 | Mugen MF308 | All |
| 8 | | All | |||
| Planex EBBRO Nova Kacchao TCPRO Nova Team Nova Oizumi Team Nova | 9 | | Lola B03/51 | Mugen MF308 | All |
| 10 | | 1–4 | |||
| | 5–7 | ||||
| | 8–10 | ||||
| Cosmo Oil Racing Team Cerumo | 11 | | Lola B03/51 | Mugen MF308 | All |
| 12 | | All | |||
| Team Impul | 19 | | Lola B03/51 | Mugen MF308 | All |
| 20 | | All | |||
| Team 22 | 22 | | Lola B03/51 | Mugen MF308 | All |
| Carrozzeria Team MOHN | 28 | | Lola B03/51 | Mugen MF308 | All |
| DoCoMo Team Dandelion Racing | 40 | | Lola B03/51 | Mugen MF308 | All |
| 41 | | All |
All races were held in Japan
| Race | Track | Date | Pole position | Fastest race lap | Winning driver | Winning team |
|---|---|---|---|---|---|---|
| 1 | Suzuka Circuit | 23 March | | | | Team Impul |
| 2 | Fuji Speedway | 6 April | | | | Team Impul |
| 3 | Mine Circuit | 27 April | | | | Team Impul |
| 4 | Twin Ring Motegi | 8 June | | | | Team 22 |
| 5 | Suzuka Circuit | 6 July | | | | DoCoMo Team Dandelion Racing |
| 6 | Sportsland SUGO | 27 July | | | | Team Impul |
| 7 | Fuji Speedway | 31 August | | | | Team Impul |
| 8 | Mine Circuit | 21 September | | | | Team Impul |
| 9 | Twin Ring Motegi | 19 October | | | | Forum Engineering ARTA Team LeMans |
| 10 | Suzuka Circuit | 2 November | | | | Team 22 |
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|
| Points | 10 | 6 | 4 | 3 | 2 | 1 |
| Rank | Name | SUZ | FUJ | MIN | MOT | SUZ | SGO | FUJ | MIN | MOT | SUZ | Points |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | 1 | 1 | 1 | 9 | 14 | 1 | 2 | 13 | 2 | 3 | 56 |
| 2 | | Ret | 2 | Ret | NC | 2 | 4 | 1 | 1 | 9 | Ret | 35 |
| 3 | | Ret | 5 | Ret | 1 | 3 | 3 | Ret | 6 | Ret | 1 | 31 |
| 4 | | 3 | 8 | 5 | 7 | Ret | 8 | Ret | 2 | 1 | Ret | 22 |
| 5 | | 2 | 4 | 7 | 6 | Ret | 2 | 3 | 9 | 5 | Ret | 22 |
| 6 | | 9 | Ret | Ret | 3 | 1 | 5 | Ret | Ret | 3 | 9 | 20 |
| 7 | | 4 | 7 | 3 | 2 | 7 | 10 | Ret | 3 | 12 | 5 | 19 |
| 8 | | Ret | NC | 2 | 4 | 5 | 7 | 6 | 12 | 6 | 4 | 16 |
| 9 | | Ret | 3 | 4 | 5 | 4 | NC | Ret | NC | 13 | 6 | 13 |
| 10 | | 12 | 6 | Ret | DNS | 6 | Ret | Ret | 14 | 4 | 2 | 11 |
| 11 | | 5 | 9 | Ret | Ret | 15 | 6 | 5 | 5 | 14 | Ret | 7 |
| 12 | | 4 | 7 | Ret | Ret | 3 | ||||||
| 13 | | 8 | Ret | Ret | 11 | 8 | 9 | 9 | 4 | 7 | 11 | 3 |
| 14 | | 6 | 10 | 8 | DNS | 12 | Ret | Ret | 10 | Ret | 10 | 1 |
| 15 | | 7 | Ret | 6 | Ret | 13 | 1 | |||||
| 16 | | Ret | Ret | Ret | 8 | 9 | 11 | 7 | 8 | 10 | 8 | 0 |
| 17 | | Ret | 11 | 7 | 0 | |||||||
| 18 | | 10 | 12 | 10 | Ret | Ret | NC | Ret | Ret | 8 | Ret | 0 |
| 19 | | Ret | Ret | 9 | 10 | 11 | Ret | Ret | 11 | Ret | Ret | 0 |
| 20 | | 10 | 12 | Ret | 0 | |||||||
| 21 | | 11 | 11 | Ret | 12 | 0 |
| Rank | Team | Car | SUZ | FUJ | MIN | MOT | SUZ | SGO | FUJ | MIN | MOT | SUZ | Points |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Impul | 19 | 1 | 1 | 1 | 9 | 14 | 1 | 2 | 13 | 2 | 3 | 91 |
| 20 | Ret | 2 | Ret | NC | 2 | 4 | 1 | 1 | 9 | Ret | |||
| 2 | Team LeMans | 7 | 3 | 8 | 5 | 7 | Ret | 8 | Ret | 2 | 1 | Ret | 38 |
| 8 | Ret | NC | 2 | 4 | 5 | 7 | 6 | 12 | 6 | 4 | |||
| 3 | PIAA Nakajima | 1 | 12 | 6 | Ret | DNS | 6 | Ret | Ret | 14 | 4 | 2 | 33 |
| 2 | 2 | 4 | 7 | 6 | Ret | 2 | 3 | 9 | 5 | Ret | |||
| 4 | Team 22 | 22 | Ret | 5 | Ret | 1 | 3 | 3 | Ret | 6 | Ret | 1 | 31 |
| 5 | Cosmo Oil Cerumo | 11 | 5 | 9 | Ret | Ret | 15 | 6 | 5 | 5 | 14 | Ret | 23 |
| 12 | 4 | 7 | 3 | 2 | 7 | 10 | Ret | 3 | 12 | 5 | |||
| 6 | DoCoMo Dandelion | 40 | 9 | Ret | Ret | 3 | 1 | 5 | Ret | Ret | 3 | 9 | 23 |
| 41 | 8 | Ret | Ret | 11 | 8 | 9 | 9 | 4 | 7 | 11 | |||
| 7 | 5ZIGEN | 5 | Ret | 3 | 4 | 5 | 4 | NC | Ret | NC | 13 | 6 | 17 |
| 6 | 7 | Ret | 6 | Ret | 13 | 4 | 7 | Ret | Ret | ||||
| 8 | Team MOHN | 28 | 6 | 10 | 8 | DNS | 12 | Ret | Ret | 10 | Ret | 10 | 1 |
| 9 | Team Nova | 9 | Ret | Ret | 9 | 10 | 11 | Ret | Ret | 11 | Ret | Ret | 0 |
| 10 | 11 | 11 | Ret | 12 | 10 | 12 | Ret | Ret | 11 | 7 | |||
| 10 | Kondo Racing Team | 3 | 10 | 12 | 10 | Ret | Ret | NC | Ret | Ret | 8 | Ret | 0 |
| 4 | Ret | Ret | Ret | 8 | 9 | 11 | 7 | 8 | 10 | 8 |