Clay Greenfield (born June 3, 1984) is an American professional driver. He currently competes part-time in the NASCAR Camping World Truck Series, driving the No. 68 Chevrolet Silverado/Dodge Ram for Clay Greenfield Motorsports.

A graduate of Clarksville Academy, early in his career Greenfield competed primarily in the UARA-Stars Series, also making several qualifying attempts in the ARCA Racing Series in the mid 2000s, his debut being at Salem Speedway in 2004. He made his debut in NASCAR competition in 2010, driving for Team Gill Racing in the Camping World Truck Series at Martinsville Speedway; over the next three years he competed in 22 races, posting a best finish of 10th at Daytona International Speedway in 2012. Greenfield also made his debut in the Nationwide Series in 2011, finishing 35th at Atlanta Motor Speedway while driving for Rick Ware Racing.

Greenfield began the 2013 season by posting the fastest time in practice for the Camping World Truck Series' season-opening event at Daytona International Speedway in February, and finished 26th in the race, but then failed to qualify for the next two races. He finished 16th at Kansas Speedway, then returned to the series at Kentucky Speedway in July, finishing 35th for Norm Benning Racing. A few weeks later, he and Norm Benning were surprisingly racing against each other for a final transfer spot in the Mudsummer Classic race yet lost it to his part-time owner. Greenfield has not driven for Benning since.

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