The 2005 Formula Nippon Championship was contested over 9 rounds, 8 teams and 17 drivers competed in the series. All teams had to use Lola B3/51 chassis and Mugen Honda (Mugen MF308) engines.
| Team | # | Driver | Chassis | Engine | Rounds |
|---|---|---|---|---|---|
| DoCoMo Team Dandelion Racing | 1 | | Lola B3/51 | Mugen MF308 | All |
| 2 | | All | |||
| Kondo Racing Team | 3 | | Lola B3/51 | Mugen MF308 | All |
| 4 | | 1–3 | |||
| | 4–9 | ||||
| Team 5ZIGEN | 5 | | Lola B3/51 | Mugen MF308 | All |
| Forum Engineering Team LeMans | 7 | | Lola B3/51 | Mugen MF308 | All |
| 8 | | All | |||
| Team Cerumo Takagi Planning with Cerumo | 11 | | Lola B3/51 | Mugen MF308 | All |
| 12 | | All | |||
| mobilecast Team Impul | 19 | | Lola B3/51 | Mugen MF308 | All |
| 20 | | All | |||
| arting Racing Team with Impul | 23 | | Lola B3/51 | Mugen MF308 | All |
| Carrozzeria Team MOHN | 27 | | Lola B3/51 | Mugen MF308 | 1 |
| 28 | | All | |||
| PIAA Nakajima Racing | 31 | | Lola B3/51 | Mugen MF308 | All |
| 32 | | All |
All races were held in Japan.
| Round | Track | Date | Pole position | Fastest lap | Winner | Team |
|---|---|---|---|---|---|---|
| 1 | Twin Ring Motegi | 3 April | | | | DoCoMoTeam Dandelion Racing |
| 2 | Suzuka Circuit | 17 April | | | | mobilecast Team Impul |
| 3 | Sportsland SUGO | 15 May | | | | arting Team Impul |
| 4 | Fuji Speedway | 5 June | | | | mobilecast Team Impul |
| 5 | Suzuka Circuit | 3 July | | | | arting Team Impul |
| 6 | Mine Circuit | 31 July | | | | mobilecast Team Impul |
| 7 | Fuji Speedway | 28 August | | | | Nakajima Racing |
| 8 | Twin Ring Motegi | 23 October | | | | arting Team Impul |
| 9 | Suzuka Circuit | 27 November | | | | PIAA Nakajima Racing |
Calendar changes
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|
| Points | 10 | 6 | 4 | 3 | 2 | 1 |
| Rank | Name | MOT | SUZ | SGO | FUJ | SUZ | MIN | FUJ | MOT | SUZ | Points |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | 4 | 4 | 1 | 2 | 1 | 3 | 13 | 1 | 2 | 52 |
| 2 | | 2 | 1 | 5 | 7 | 8 | 1 | 3 | 4 | 3 | 39 |
| 3 | | 1 | 5 | 2 | 4 | 3 | Ret | 4 | 13 | 5 | 30 |
| 4 | | 11 | Ret | 9 | Ret | Ret | 10 | 1 | Ret | 1 | 20 |
| 5 | | Ret | 3 | 3 | 8 | 2 | Ret | 11 | 9 | 6 | 15 |
| 6 | | 6 | 9 | Ret | 1 | Ret | Ret | 12 | 11 | 4 | 14 |
| 7 | | 10 | 2 | Ret | 3 | 6 | 4 | 9 | 10 | 8 | 14 |
| 8 | | 5 | Ret | 4 | Ret | Ret | 5 | 5 | 3 | Ret | 13 |
| 9 | | 5 | 5 | 2 | Ret | 5 | 10 | 12 | |||
| 10 | | 14 | Ret | Ret | Ret | 4 | 8 | Ret | 2 | 11 | 9 |
| 11 | | 7 | 8 | 8 | Ret | Ret | 7 | 2 | 6 | 7 | 7 |
| 12 | | 3 | 6 | 6 | 10 | 7 | 6 | 7 | 7 | 14 | 7 |
| 13 | | 8 | Ret | Ret | 6 | Ret | Ret | 6 | 12 | 9 | 2 |
| 14 | | 12 | 7 | 7 | 0 | ||||||
| 15 | | 9 | Ret | 11 | 9 | 10 | 9 | 8 | Ret | 12 | 0 |
| 16 | | Ret | Ret | 10 | Ret | 9 | Ret | 10 | 8 | 13 | 0 |
| 17 | | 13 | 0 |
| Rank | Team | Car | MOT | SUZ | SGO | FUJ | SUZ | MIN | FUJ | MOT | SUZ | Points |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | mobilecast Impul arting Impul | 19 | 6 | 9 | Ret | 1 | Ret | Ret | 12 | 11 | 4 | 101 |
| 20 | 2 | 1 | 5 | 7 | 8 | 1 | 3 | 4 | 3 | |||
| 23 | 4 | 4 | 1 | 2 | 1 | 3 | 13 | 1 | 2 | |||
| 2 | DoCoMo Dandelion | 1 | 1 | 5 | 2 | 4 | 3 | Ret | 4 | 13 | 5 | 37 |
| 2 | 3 | 6 | 6 | 10 | 7 | 6 | 7 | 7 | 14 | |||
| 3 | PIAA Nakajima | 31 | 11 | Ret | 9 | Ret | Ret | 10 | 1 | Ret | 1 | 35 |
| 32 | Ret | 3 | 3 | 8 | 2 | Ret | 11 | 9 | 6 | |||
| 4 | Kondo Racing Team | 3 | 14 | Ret | Ret | Ret | 4 | 8 | Ret | 2 | 11 | 21 |
| 4 | 12 | 7 | 7 | 5 | 5 | 2 | Ret | 5 | 10 | |||
| 5 | Team LeMans | 7 | 7 | 8 | 8 | Ret | Ret | 7 | 2 | 6 | 7 | 20 |
| 8 | 5 | Ret | 4 | Ret | Ret | 5 | 5 | 3 | Ret | |||
| 6 | 5ZIGEN | 5 | 10 | 2 | Ret | 3 | 6 | 4 | 9 | 10 | 8 | 14 |
| 7 | Cerumo | 11 | 8 | Ret | Ret | 6 | Ret | Ret | 6 | 12 | 9 | 2 |
| 12 | 9 | Ret | 11 | 9 | 10 | 9 | 8 | Ret | 12 | |||
| 8 | Team MOHN | 27 | 13 | 0 | ||||||||
| 28 | Ret | Ret | 10 | Ret | 9 | Ret | 10 | 8 | 13 |