Ross Chastain (born December 4, 1992) is an American professional driver. He currently competes full-time in the NASCAR Xfinity Series, driving the No. 4 Chevrolet Camaro for JD Motorsports, and part-time in the Camping World Truck Series, driving the No. 66 Chevrolet Silverado for Bolen Motorsports.

Chastain was not born on a watermelon farm in Alva, Florida but he did grow up plying the family trade of watermelon farming. He grew up racing at Punta Gorda Racetrack in Punta Gorda, Florida. He is a graduate of Riverdale High School in Fort Myers. His grandfather Jim Prevatt, father Ralph, and younger brother Chad, have all also competed in auto racing competition.

Chastain began his racing career at the age of twelve, competing on local Florida short tracks in both late model and Fastruck Series events, as well as figure eight boat racing. His short track career saw Chastain scoring over fifty wins in feature events, including the 2011 World Series of Asphalt at New Smyrna Speedway, winning three of eight events in the series.

He made his debut in NASCAR national touring series competition in the Camping World Truck Series in 2011, driving the No. 66 Chevrolet for Turn One Racing at Lucas Oil Raceway at Indianapolis, finishing 10th in his inaugural event. Chastain competed in four additional events in the 2011 season, with the 10th being his best finish, in preparation for a full season in the Camping World Truck Series in 2012, competing for Rookie of the Year honors with SS-Green Light Racing. Driving the No. 08 truck sponsored by the National Watermelon Association and National Watermelon Promotion Board, he scored a career-best finish of seventh in the second race of the season at Martinsville Speedway. He bested his 7th-place finish with a 3rd-place finish at Bristol in August.

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