NASCAR on Fox is the branding used for Fox Sports's Emmy-winning broadcasts of NASCAR races on the Fox network in the USA since 2001. The production has been in high-definition since 2005.

On November 11, 1999, a new contract was signed for American television broadcast rights for NASCAR, split between Fox/FX and NBC/TBS (later TNT) beginning in 2001. Fox/FX would cover the first half of the season while NBC/TNT would air the second half of the season.

From 2001–2006, Fox alternated coverage of the first and most famous race of the season, the Daytona 500, with Fox getting the odd years and NBC the even ones. For balance, the opposite network would air Daytona's July race, the Pepsi 400. This particular television contract was signed for eight years for Fox/FX and six years for NBC/TNT and was valued at $2.4 billion. In addition to coverage on the Fox Broadcasting Company, the Fox-owned Speed Channel carried the entire Craftsman Truck Series schedule, a contract they bought out from ESPN in October 2002.