Norbert Siedler (born 29 December 1982 in Wildschönau) is an Austrian racing driver who currently competes in the 2025 Nürburgring Langstrecken-Serie for Eastalent Racing in a Audi R8 LMS GT3 Evo II.
Siedler began his career in motorsport in karts. In 1992, he began at the age of ten years in the German Kartszene and in 1997, won the junior class. In 1999, he was an Austrian kart driver. In 2000, he moved into Formula Ford and won in Germany and Austria as well as the championship. In 2001, he drove in the German Formula Three Championship. For the team Palfinger, he finished fourth place twice, including once at Hockenheim supporting the German Grand Prix. In 2002, he was sixth in the championship and finished the season with a victory in the last race at Hockenheim. This was followed by three years in the Italian Euro Formula 3000 Championship. In 2005, he won the championship after two victories in eight races overall standings.
In 2003, Siedler traveled to Vallelunga for a Formula One test with Minardi. In 2007 he drove for Kruse Motorsport in the LMP2 class in the Le Mans Endurance Series finishing fifth place at Monza. He made his debut in the Le Mans 24 Hours, again in a Kruse Motorsport Pescarolo-Judd, ending with an engine failure after 98 laps.
Towards the end of the 2007 season, Siedler joined ADM Motorsport in the new racing series International Formula Master. He began his career in the series with victory at Porto and Anderstorp.
Since 2008, Siedler has run in the Porsche Supercup.
() (Races in bold indicate pole position) (Races in italics indicate fastest lap)