| 1 | Okayama GT 300 km | 
Drivers and teamsVehicle changesEntrant changesGT500Honda:
- * With the Weider Honda Racing Team leaving Super GT, Naoki Yamamoto moved to Team Kunimitsu to partner Takuya Izawa. Frederic Makowiecki will not return to the series.
- * After years of being with Real Racing, Toshihiro Kaneishi will not drive for this season, being replaced by former Team Kunimitsu driver Hideki Mutoh.
- * Weider Honda Racing leave the Super GT series, and the entrant replaced by the Drago Modulo Honda Racing Team. They utilize Bridgestone tyres. Oliver Turvey joined Drago Modulo Honda Racing, partnering Takashi Kogure.
- * Team Mugen withdrew from the series.
- * ARTA driver Vitantonio Liuzzi will be replaced by former Mugen driver Tomoki Nojiri after a disappointing season last year.
- * Nakajima Racing changed the car number from 32 to 64.Toyota:
- * Kazuki Nakajima, like Oliver Jarvis, will not return to focus on his LMP1 drive in the 2015 World Endurance Championship.Daisuke Ito will move from the KeePer TOM'S team to the Petronas TOM'S team. Ryo Hirakawa, who previously drove for the Petronas TOM'S team, joined the KeePer TOM'S team.
- * Oliver Jarvis left the series to drive for Audi Sport Team Joest in the 2015 World Endurance Championship. Former F1 driver Heikki Kovalainen joined the SARD team, replacing Oliver Jarvis.Hiroaki Ishiura swapped seats with Kohei Hirate at the Zent Cerumo Team, while Hirate for SARD. Nissan:
- * Lucas Ordonez moves from NDDP Racing to drive for Kondo Racing for the first three rounds. Michael Krumm replaces him to drive the remaining rounds.
GT300Mid-season changes- From round 6 and up, Team UPGARAGE with BANDOH will change their racing number from 18 to 20.
- Audi Team Racing Tech left the series after the Suzuka round due to a severe accident. They will return in 2016 with the upgraded Audi R8 LMS ultra.
Championship standings;Scoring system
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th | | Points | 20 | 15 | 11 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | | Suzuka | 25 | 18 | 13 | 10 | 8 | 6 | 5 | 4 | 3 | 2 |
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