The 2005 Autobacs Super GT Series was the 12th season of the GT Championship in Japan including the All-Japan Grand Touring Car Championship (JGTC) era, and the 1st season as the Super GT series. 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 champions were Yuji Tachikawa and Toranosuke Takagi in GT500; and Kota Sasaki and Tetsuya Yamano in GT300.
Overall winner in bold