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.