In Grand Theft Auto V, the fictional car manufacturer based on Lamborghini is Pegassi.
Pegassi represents an Italian-style performance and luxury marque in GTA V. Its lineup includes fast supercars and motorcycles, combining recognizable design cues from real-world manufacturers while using original names and fictional branding. The brand’s Lamborghini inspiration is particularly apparent in vehicles such as the Infernus, Vacca, Zentorno, and Tempesta.
Rockstar uses fictional manufacturers throughout the series to avoid directly reproducing real automotive brands. These invented companies often blend several inspirations, but Pegassi is most strongly associated with Lamborghini and, for some two-wheeled vehicles, Ducati.
The alternatives point to other real-world influences. Grotti is primarily modeled after Ferrari, Truffade evokes Bugatti, and Benefactor draws heavily from Mercedes-Benz. Because several GTA manufacturers sell high-performance cars, identifying the brand rather than just the vehicle’s appearance is the key to this question.