William R. "Doc" Spencer (born June 12, 1967) is a former county legislator and physician in Suffolk County, New York. He represented the 18th Legislative District, which comprises the communities Asharoken, Cold Spring Harbor, Centerport, Eaton's Neck, Greenlawn, Halesite, Huntington Bay, Huntington, Lloyd Harbor, and Northport. Additionally, the district included portions of Huntington Station and East Northport. In November 2021, Spencer was charged by the Suffolk County District Attorney's office with 9 counts, including 7 felonies, relating to an alleged pills-for-sex scheme.