Offenhauser was an American racing car engine manufacturer.

The company was founded in 1933 by Fred Offenhauser and initially built engines for " Midgets ", ie small separation cars. 1946 took over the three-time Indianapolis 500 winner Louis Meyer operation and continued he extremely successful. Noteworthy was the construction of a monoblock engine, indicating a head gasket allowed higher mean pressures under waiver. No less than 27 times won a with this engine, often abbreviated parlance to " Offy ", propelled vehicle the Indianapolis 500, including all eleven races, which included the Formula 1 World Championship ( 1950-1960 ). The most successful team was there, the U.S. Kurtis Kraft team.