Maserati 150S is a racing car made by Maserati of Italy alongside the Maserati 200S, to take over for the aging Maserati A6GCS racing variants. Depending on the source, between twenty-four and twenty-seven examples were built, and one additional street-going car, called the Maserati 150 GT.

Maserati A6 were a series of grand tourers, racing sports cars and single seaters made by Maserati of Italy between 1947 and 1956. They were named for Alfieri Maserati and for their straight-six engine.