Ross Lee Chastain is an American professional stock car racing driver. He competes full-time in the NASCAR Cup Series, driving the No. 1 Chevrolet Camaro ZL1 for Trackhouse Racing and part-time in the NASCAR Craftsman Truck Series, driving the No. 45 Chevrolet Silverado for Niece Motorsports. He is the older brother of fellow NASCAR driver Chad Chastain.

Trackhouse Racing is an American motorsports organization that competes in the NASCAR Cup Series and MotoGP. The team is owned by Trackhouse Entertainment Group, a venture of Justin Marks and Grammy Award-winning rapper Armando Christian "Pitbull" Pérez.