William Byron (born November 29, 1997) is an American professional driver. He currently competes full-time in the NASCAR Xfinity Series, driving the No. 9 Chevrolet Camaro for JR Motorsports. He won the 2015 NASCAR K&N Pro Series East championship and the Sunoco Rookie of the Year Award in the 2016 NASCAR Camping World Truck Series season.

Byron became interested in racing when he was six years old after seeing a race on television, later attending a race at Martinsville Speedway in 2006. He began racing on the iRacing simulator as a teenager, with over 100 wins and 298 top fives in online competition. In 2012, he and his father explored how Byron could start racing offline – in real cars. He started racing Legends that year at the age of 15, relatively late for modern drivers. That year he won 33 races and became the Legend Car Young Lions Division champion.

For 2014, Byron signed with JR Motorsports late model program, in addition to continuing Legends competition. Byron competed in the No. 9 Liberty University Chevrolet at Hickory Motor Speedway in North Carolina for JRM. Byron scored a single victory and 11 top-five finishes, finishing second in points to teammate Josh Berry at Hickory.

Byron was signed to drive in the NASCAR K&N Pro Series East for 2015 by HScott Motorsports with Justin Marks, with sponsorship from Liberty University. Byron also continued racing late models for JR Motorsports. In his debut K&N East in February at New Smyrna Speedway, Byron finished 7th. Byron won the second race of the season at Greenville-Pickens Speedway after starting second and leading all 152 laps (two laps past the scheduled distance). Byron made his ARCA Racing Series debut at Lucas Oil Raceway in July, driving the No. 55 Liberty University Toyota Camry for Venturini Motorsports. Byron finished second after leading 120 laps. He scored four K&N East wins en route to winning the series championship.

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