This is a list of vehicle brands that appear throughout the Grand Theft Auto series. They were very rarely encountered in the 3D Universe games, however their use was greatly expanded in the HD Universe, where every car has a designated brand.
In Grand Theft Auto: San Andreas for PC, there is a data file titled carcols.dat which names some vehicle brands: one known brand (Maibatsu), one later-known brand (Shitsu, not Shitzu) and two unknown brands (Nioka and Kunst). So far, no one can tell which vehicles these brands have produced in the game.
In Grand Theft Auto IV, the Super GT featured "Asstone" badges in the beta as seen in a television program ingame. This brand appears to have been based on Aston Martin, but it went unused in the final game and was replaced with Dewbauchee as the ingame parody of Aston Martin, as the Super GT is made by Dewbauchee in the final game.
In Grand Theft Auto V, there are audio files for an unused manufacturer by the name "Skiver". It is unknown why this manufacturer went unused and the only remaining evidence for its existance are the audio files for the police scanner. Its name comes from "Skive" meaning to be absent from work or school without permission, which might suggest Skiver would have been a manufacturer of work or construction vehicles, similar to HVY or Brute.