The 2005 Autobacs Super GT Series was the thirteenth season of the Japan Automobile Federation Super GT Championship including the All Japan Grand Touring Car Championship (JGTC) era and the first season as the Super GT series. It is also marked as the twenty-third season of a JAF-sanctioned sports car racing championship dating back to the All Japan Sports Prototype Championship. It is a series for Grand Touring cars divided into 2 classes: GT500 and GT300. The season began on March 27 and ended on November 6, 2005 after 8 races.The drivers' champions were Yuji Tachikawa and Toranosuke Takagi in GT500; and Kota Sasaki and Tetsuya Yamano in GT300.
| Round | Race | Circuit | Date | |
|---|---|---|---|---|
| 1 |  Okayama GT 300 km Race | Okayama International Circuit | March 27 | |
| 2 | Fuji GT 500 km Race | Fuji International Speedway | May 4 | |
| 3 |  Japan GT Championship Malaysia | Sepang International Circuit | June 26 | |
| 4 | SUGO GT 300 km Race | Sportsland Sugo | July 24 | |
| 5 | Motegi GT 300 km Race | Twin Ring Motegi | September 4 | |
| 6 | Fuji GT 300 km Race | Fuji International Speedway | September 25 | |
| 7 | Super GT in Kyushu GT 300 km | Autopolis International Race Course | October 16 | |
| 8 | Suzuka GT 300 km | Suzuka Circuit | November 6 |
Overall winner in bold
| Round | Circuit | GT500 Winning Team | GT300 Winning Team |
|---|---|---|---|
| GT500 Winning Drivers | GT300 Winning Drivers | ||
| 1 | Okayama | #25 Eclipse Advan Supra | #13 Endless Advan Z |
| Manabu Orido Dominik Schwager | Mitsuhiro Kinoshita Masami Kageyama | ||
| 2 | Mt. Fuji | #38 Zent Cerumo Supra | #0 Ebbro M-TEC NSX |
| Yuji Tachikawa Toranosuke Takagi | Haruki Kurosawa Shinya Hosokawa | ||
| 3 | Kuala Lumpur | #1 Xanavi Nismo Z | #43 ARTA Garaiya |
Satoshi Motoyama  Richard Lyons | Morio Nitta Shinichi Takagi | ||
| 4 | Sportsland SUGO | #37 Dynacity TOM'S Supra | #31 Kicchouhouzan MR-S |
| Tatsuya Kataoka Sakon Yamamoto | Minoru Tanaka Kazuki Nakajima | ||
| 5 | Motegi | #100 Raybrig NSX | #46 Dream Cube's Advan Z |
 Sebastien Philippe Jeremie Dufour | Kazuki Hoshino Takayuki Aoki | ||
| 6 | Mt. Fuji | #38 Zent Cerumo Supra | #0 Ebbro M-TEC NSX |
| Yuji Tachikawa Toranosuke Takagi | Haruki Kurosawa Shinya Hosokawa | ||
| 7 | Autopolis | #8 ARTA NSX | #30 Reckless MR-S |
| Daisuke Ito Ralph Firman | Kota Sasaki Tetsuya Yamano | ||
| 8 | Suzuka | #38 Zent Cerumo Supra | #11 Jim Gainer Ferrari Dunlop |
| Yuji Tachikawa Toranosuke Takagi | Tetsuya Tanaka Paolo Montin |
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th |
|---|---|---|---|---|---|---|---|---|---|---|
| Points | 20 | 15 | 12 | 8 | 6 | 5 | 4 | 3 | 2 | 1 |
| Qualifying | 2 | 1 | 1 | |||||||
| Fastest Lap | 1 | 1 | 1 | |||||||
For teams that entered multiple cars, only the best result from each round counted towards the teams' championship.[1]
| Rank | Team | No. | OKA | FUJ | SEP | SUG | MOT | FUJ | AUT | SUZ | PTS | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Nismo | 1 | Ret | 4 | 1 | 8 | 6 | 10 | 6 | 2 | 86 | |
| 22 | 12 | 2 | 6 | 7 | 4 | 9 | 2 | 8 | ||||
| 2 | Team Honda Racing | 8 | 4 | 12 | 2 | 6 | 16 | 8 | 1 | 12 | 82 | |
| 18 | 7 | 13 | 7 | Ret | 2 | 11 | 5 | 6 | ||||
| 3 | Toyota Team TOM'S | 36 | 2 | 10 | 3 | 3 | 7 | 5 | 8 | 5 | 73 | |
| 37 | 6 | 6 | 13 | 1 | 8 | 7 | Ret | 7 | ||||
| 4 | Toyota Team Cerumo | 38 | 14 | 1 | 11 | 11 | 12 | 1 | 7 | 1 | 67 | |
| 5 | Esso Toyota Team LeMans | 6 | 11 | 5 | 4 | 4 | 9 | 3 | 10 | 3 | 51 | |
| 6 | Hasemi Motorsport | 3 | 3 | 9 | Ret | 15 | 13 | 4 | 3 | 4 | 42 | |
| 7 | Nakajima Racing | 32 | 5 | 8 | 5 | 13 | 10 | 2 | 14 | 10 | 38 | |
| 8 | Team Impul | 12 | Ret | 15 | 8 | 5 | 3 | 13 | 4 | 9 | 35 | |
| 9 | Kraft | 34 | Ret | 7 | 12 | 14 | 11 | 16 | 12 | 16 | 29 | |
| 35 | 9 | 3 | 14 | 10 | 5 | 6 | 9 | 13 | ||||
| 10 | Team Advan Tsuchiya | 25 | 1 | 14 | 15 | 9 | 15 | Ret | Ret | 14 | 26 | |
| 10 | Team Kunimitsu | 100 | 10 | 11 | 10 | Ret | 1 | 14 | Ret | Ret | 26 | |
| 12 | Toyota Team SARD | 39 | 8 | Ret | 9 | 2 | 14 | 12 | 11 | 11 | 21 | |
| rowspan="2" | - | Hitotsuyama Racing | 20 | DNS | 17 | 0 | ||||||
| 21 | Ret | Ret | Ret | 12 | Ret | 15 | 13 | 15 | ||||
| - | JLOC | 88 | 13 | DNS | Ret | 17 | Ret | 0 | ||||
| Rank | Team | No. | OKA | FUJ | SEP | SUG | MOT | FUJ | AUT | SUZ | PTS |
| Rank | width=160 | Drivers | width=200 | Number/Team | Points | Wins |
|---|---|---|---|---|---|---|
| 1 | Kota Sasaki Tetsuya Yamano |
| 93 | 1 | ||
| 2 | Haruki Kurosawa Shinya Hosokawa | 81 | 2 | |||
| 3 | Morio Nitta Shinichi Takagi | 74 | 1 |
| Rank | width=220 | Number/Team | width=160 | Car | Points |
|---|---|---|---|---|---|
| 1 |
| Reckless MR-S | 93 | ||
| 2 | Ebbro M-TEC NSX | 81 | |||
| 3 |
| ARTA Garaiya | 74 |
