The Lime Rock Grand Prix (2010 name: Memorial Day Classic) is a sports car race held at Lime Rock Park in Lakeville, Connecticut, United States on the Memorial Day weekend. It had been a part of the Grand-Am Rolex Sports Car Series, SCCA National Sports Car Championship, USAC Road Racing Championship, Trans-Am Series, IMSA GT Championship and United States Road Racing Championship. The revived version in 2017 is for the United States Auto Club Pirelli World Challenge.