Justin Marks (born March 25, 1981) is an American professional driver. He currently competes part-time in the NASCAR Xfinity Series, driving the No. 42 Chevrolet Camaro for Chip Ganassi Racing, and part-time in the Camping World Truck Series, driving the No. 32 Toyota Tundra for Braun Motorsports.

Marks was born in St. Louis, Missouri. As a boy he went with his grandfather (who lived in Iowa), to see local Midwest racers such as Dick Trickle, Ken Schrader, and the Wallace brothers battle on dirt tracks. His family moved to Menlo Park, California when Marks was eight. Marks attended race school while in high school and in 1998 competed in his first race, in the street stock division at Altamont Raceway Park in Tracy, California. At the same time as his racing career was beginning, he was attending California State University with the intention of obtaining a degree in sports marketing. Marks withdrew from college 14 credits shy of completing his degree to focus on racing.

At 18, Marks entered the SCCA Regional Racing Series, and later the Speed World Challenge Series. With success in the SCCA, Marks moved to the Rolex Sports Car Series GT Class in 2004 where he met good friend Joey Hand. Switching between the GT class and the World Challenge, Marks raced up four wins, eight podiums, and thirteen top tens between the two series. In 2005 Marks again raced in the Rolex Sports Car Series where he won 3 races with teammate Joey Hand. At the same time, Marks teamed with Bill Auberlen in the Continental Tire Sports Car Challenge for Turner Motorsport, finishing 3rd in points with 5 poles and 5 wins in 9 starts.

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