The Audi R10 TDI, usually abbreviated to R10, is a diesel-powered racing car from the German car manufacturer Audi. The car dominated Le Mans, winning each year from its 2006 introduction until it was replaced by the R15 in 2009. It was designed and constructed for sports car racing in the Le Mans Prototype LMP1 class of the 24 Hours of Le Mans, and other similar endurance races. The car was unveiled 13 December 2005 and went on to win both its maiden race at the 2006 12 Hours of Sebring in March, and the June 2006 24 Hours of Le Mans.

It was the first diesel to win either of those events. At $15 million a year it was the most ambitious and most expensive project ever undertaken by Audi Sport.