Grunberg was a French automotive manufacturer founded in 1960 by Rodolphe Grunberg. The company specialized in producing small, lightweight vehicles, with its most notable model being the RG125.

The RG125 was a compact two-seater roadster that featured a 125cc single-cylinder two-stroke engine. This engine allowed the vehicle to achieve a top speed of over 40 mph (64 km/h), while the car itself weighed only 150 kg.

Grunberg's focus on minimalistic design and efficient engineering reflected the automotive trends of the era, although the company did not achieve widespread recognition and remained a niche player in the automotive market.