The Bugatti Type 51 Dubos Coupe is a one-off automobile originally built by Bugatti in 1931 as an open-top Bugatti Type 51 race car that was driven by legendary racer Louis Chiron, and then modified by Louis Dubos to be a luxury road coupe. It is one of the most valuable cars in the world, estimated at around $20 million dollars as of 2023.

The Bugatti Type 51 series succeeded the famous Type 35 as Bugatti's premier racing car for the 1930s. The main distinction is that it uses a twin cam engine. Unlike the dominant Type 35s of the prior decade, the Type 51 were unable to compete with the government-supported German and Italian offerings.