The Renault Monasix (Type RY) was a compact car or small family car manufactured between 1927 and 1932 by Renault.

With its 1,476 cc displacement the engine, of an 8CV tax horsepower rating, was one of the smallest six cylinder engines available at the time.

[1] Starting in 1928, the "Compagnie Générale des voitures à Paris", the main Paris taxi company, purchased a large number of the cars and painted them in the same shade of green as that used for the city's buses:[1] 5,000 taxi versions were made, the last of which were used in Paris until 1962.

In competition, the Monasix was raced in the Morocco Rally in 1928.

Production ended in 1932 and the car was replaced by the Renault Monaquatre.