The series' original logo were stylized letters "GT", the G in blue while the T is in red. This specific version was only used in 1997, for the first game.
Alternate version of the logo where the bottom of the "GT" is only visable, as blue and red stripes.
Alternate version with a slightly less extended "G" used from 1999.
Starting with Gran Turismo PSP, the series' logo was given a glossy look.
Glossy version of the alternate logo.
Starting with Gran Turismo 6 the logo returned to a flat look and is now solely black, or white when on dark backgrounds.
Black version of the alternate logo.