The WM P83 was a prototype racecar produced between 1983 and 1986 by Welter Racing. The cars were used in the 24-hour race at Le Mans.

The chassis was a monocoque construction and the body extended down over the rear wheels, a typical feature of a Welter Racing Car. Gérard Welter was an aerodynamics expert as well as a vehicle designer who previously worked at Peugeot. He worked using a wind tunnel to test his designs. A huge rear wing ensured the down force needed over the rear axle. The P83 was fitted with a Peugeot 2.8-litre 6-cylinder turbo engine which produced nearly 420hp.

At Le Mans, two cars were used in the practise round and reached 17th and 18th. The car numbered number 9 had Belgian driver, Didier Theys behind the wheel and the car numbered number 10 had Pascal Fabre behind the wheel. They both finished the race after 102 laps. The Peugeot engines were running so hot that they would no longer turn over.  Despite the issue the team finished 16th overall.

In 1984, the vehicles have been revised and were now called the WM P83B. These were then again entered at Le Mans. The rear of the body was widened and the covers over the rear wheels were retained. When the cars were entered in the 1984 24 Hour Race at Le Mans, Roger Dorchy went from eighth on the grid to grab a surprising lead. This lasted only a short while and Dorchy was oused from the top spot.

1986 saw the last year that the P83 was entered at Le Mans. This was due to the introduction of the P86.