Matthew R. Mills (born November 14, 1996) is an American professional stock car racing driver. He last competed part-time in the NASCAR Xfinity Series, driving the Nos. 5, 55, 78, and 99 Chevrolet Camaros for B. J. McLeod Motorsports and part-time in the NASCAR Camping World Truck Series, driving the No. 20 Chevrolet Silverado for Young's Motorsports.