William Sawalich (born October 3, 2006) is an American professional stock car racing driver. He competes full-time in the ARCA Menards Series East, part-time in the ARCA Menards Series and ARCA Menards Series West, driving the No. 18 Toyota Camry for Joe Gibbs Racing, part-time in the NASCAR Craftsman Truck Series, driving the No. 1 Toyota Tundra for Tricon Garage, and part-time in the NASCAR Xfinity Series, driving the No. 19 Toyota Supra for JGR. He is the 2023 ARCA Menards Series East champion.