The 2020 O'Reilly Auto Parts 500 was a NASCAR Cup Series race that was originally scheduled to be held on March 29, 2020, and was rescheduled to July 19, 2020, at Texas Motor Speedway in Fort Worth, Texas. Contested over 334 laps on the 1.5-mile (2.4 km) intermediate quad-oval, it is the 18th race of the 2020 NASCAR Cup Series season. Austin Dillon won, bringing Richard Childress Racing their first 1-2 finish since the 2011 Good Sam Club 500.

Austin Reed Dillon, self-nicknamed "the Ace", is an American professional stock car racing driver. He competes full-time in the NASCAR Cup Series, driving the No. 3 Chevrolet Camaro ZL1 for Richard Childress Racing. He is the grandson of RCR team owner Richard Childress, the older brother of Ty Dillon who competes full-time in the NASCAR Craftsman Truck Series, and the son of Mike Dillon, a former racing driver who currently works as RCR's general manager.