Rolf Johann Stommelen (German pronunciation: [ʁɔlf ˈjoːhan ˈʃtoːmeln̩]; 11 July 1943 – 24 April 1983) was a German racing driver, who competed in Formula One from 1969 to 1978. In endurance racing, Stommelen was a four-time winner of the 24 Hours of Daytona with Porsche.

Stommelen participated in 63 Formula One Grands Prix, achieving one podium and 14 championship points. He also participated in several non-championship Formula One races. He was widely successful in sports car racing from the mid-1960s until his death in 1983, winning the 24 Hours of Daytona four times: in 1968, 1978, 1980 and 1982. He also won the 1967 Targa Florio with Porsche.

Rolf Johann Stommelen was born on 11 July 1943 in Siegen, Prussia, Nazi Germany.

Stommelen won the pole position for the 1969 24 Hours of Le Mans in a Porsche 917 a year after finishing third in a Porsche 908. In this year, he became the first man to reach speeds exceeding 350 km/h (217 mph) on the Le Mans circuit's Mulsanne Straight in his Porsche 917 LH. In 1970, he made his Formula One debut with Brabham with sponsorship obtained from the German magazine Auto, Motor und Sport and raced both sportscars (Toj and Porsche works teams) and Formula 1 throughout the 1970s.

Stommelen inadvertently played a role in the end of the Spanish Grand Prix's tenure at Montjuich Park in Barcelona when he crashed there in the 1975 race after the rear wing of his Hill GH1 failed which caused his car to fly into the crowd, resulting in the deaths of five spectators and him being seriously injured.

After his recovery, Stommelen returned to sports car racing, winning races for Alfa Romeo and also winning the 24 Hours of Daytona a further three times.

In 1976, Stommelen had the honour to drive the maiden race of the Porsche 936 at the 300 km Nürburgring race. With a black body and without the air-intake, the 936 of this race became known as the black widow. He qualified second, between the factory Renault Alpine A442 of Patrick Depailler and Jean-Pierre Jabouille in first and third. The Renault team was eager to win at Porsche's home soil. On race-day in heavy rain, Stommelen managed to overtake the Renault in front right after the start. Now in the lead, he rushed towards the Nordkehre, braked and deliberately left room for the Renaults in pursuit to overtake. The Renaults, wanting to take back the lead after 2 of 300 km, rushed past Stommelen into the water puddles and crashed into the catch-fences in tandem, with Stommelen taking back the lead again. This led to the saying "On the Nordschleife, you can never brake later than Rolf Stommelen!". After the sixth lap, the throttle cable of the 936 stuck in the "open" position. But instead of giving up, Stommelen continued the race by turning off the master switch at the bends to brake, and turning on the master switch again after the bends to accelerate throughout the rest of the race, taking second place at the end of the race.

In 1978, Stommelen was given the task by the Porsche factory to drive the Porsche 935 "Moby Dick" in Martini Colors. The 78 "Moby Dick" had a 3.2-litre Turbo Engine that produced 845 HP and Stommelen was, with 235 mph, (365 km/h) the fastest man on the Mulsanne Straight, faster than the prototypes like the Porsche 936 and the Renault Alpine A442B which won the race. Due to high fuel-consumption of the engine, Stommelen had to pit too often to battle for the win.