John Nielsen (born 7 February 1956) is a Danish former racing driver. He won the 24 Hours of Le Mans in 1990. Nielsen was born in Varde. Prior to his win at Le Mans, he won the 1984 Macau Grand Prix, and the 1985 Curaçao Grand Prix. He was also a 3-time champion of the European Formula Super Vee Championship from 1979 to 1981. He is now a Formula 1 commentator for TV3+ in Denmark, but also works in public.

Complete International Formula 3000 results

(key) (Races in bold indicate pole position; races in italics indicate fastest lap; small number denotes finishing position.) ‡ Half points awarded. Nielsen also entered one non-championship F3000 race, the 1985 Curaçao Grand Prix. Driving the Ralt RB20 with Cosworth engine that he had used in that year's championship, he won the race and set the fastest lap.

24 Hours of Le Mans results

Complete JGTC results

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)