The Porsche 934 was a racing version of the Porsche 911 Turbo, prepared to FIA Group 4 rules, similar to the Porsche 935 which was prepared to FIA Group 5 rules.

The Porsche 934 was introduced for the 1976 racing season. It was manufactured for two years, 1976 and 1977, with at least 400 being manufactured. Toine Hezemans drove this car to victory at the European GT Championship, while in the U.S., with George Follmer at the wheel, it also became the Trans-Am champion. It continued to win races throughout the late 1970s.

The 934 as well as the 935 were raced in the Deutsche Rennsport Meisterschaft in a distinctive orange "Jägermeister" livery.

The 934 has a top speed approaching 190 mph (approximately 300 km/h) and has a zero to 60 mph (97 km/h) time of 3.9 seconds. It was one of the last designs to incorporate all the distinctive stylings of the original 911s, with only minor bodywork taken from the 911 Turbo, to include GRP (glass-reinforced plastic) wheelarch extensions, doors, engine lid and boot.

The car came in a regular trim, or a racing trim (also called "Group 4 trim"). Regular trim:

• 1,090 kg (2,403 lb)
• Electric windows and door trim
• 32 gallon gas tank.^{[clarification needed]}
• 480 bhp (358 kW) 3-litre, flat-six engine (in 1977, modifications took it to 550 bhp)

The racing trim was a modified regular trim to meet with the FIA rules, most notably it added 30 kg (66 lb) of weight, so that it complied with the minimum weight requirement of Group 4.

The Porsche 935 was a racing car made by German carmaker Porsche, introduced in 1976. As the factory racing version of the Porsche 911 turbo prepared for FIA-Group 5 rules, it was an evolution of the Porsche Carrera RSR 2.1 turbo prototype, the second place overall finisher in the 1974 24 Hours of Le Mans.

Beginning with the 1977 season, Porsche offered the 935 to customers entering the World Championship for Makes, in the IMSA GT Championship and in the German Deutsche Rennsport Meisterschaft (DRM). The 935 went on to win the 1979 24 Hours of Le Mans overall, and other major endurance races, including Sebring, Daytona, and the 1000 km Nürburgring. Of the 37^] races it was entered, it won 123.

Usually, no other make could challenge the Porsche 935, due to the availability of customer models. Each race, at the time, typically featured at least five 935s. The large turbocharger was used with mechanical fuel injection which caused turbo lag followed shortly by a fireball spitting from the exhaust and an enormous amount of power (up to 845 hp). The dominance of the 935 was ended by the FIA rules changes which came into effect in 1982, when the six numbered groups were replaced by only three groups, A, B and C.