This article examines Rockefeller Republicanism and its status within the Republican Party by looking at the evolution of Nelson Rockefeller’s support for social welfare policy between 1958 and 1975. New York Governor Nelson Rockefeller regularly appears in histories of modern conservatism as the embodiment of the liberalism that conservatives rejected, but these works rarely account for the entirety of Rockefeller’s career. Rather than focus on Rockefeller’s challenges to the national Republican Party in 1960 and 1964, which results in an incomplete representation of Rockefeller Republicanism, this article reassesses moderate Republicanism’s perceived dominance and Rockefeller’s advocacy for liberal domestic policies and commitment to racial liberalism in New York. A full account of Rockefeller’s struggles to find common ground with conservative New York Republicans and adoption of conservative positions related to law enforcement and welfare reform thwarted one of the GOP’s best opportunities to assemble a multiracial and cross-class constituency.