Winthrop Rockefeller (May 1, 1912 – February 22, 1973) was an American politician and philanthropist. Rockefeller was the fourth son and fifth child of American financier John D. Rockefeller Jr. and Abby Aldrich Rockefeller. He was one of the grandchildren of Standard Oil co-founder John D. Rockefeller. As an entrepreneur in Arkansas, he financed many local projects, including a number of new medical clinics in poorer areas, before being elected state governor in 1966, as the first Republican governor of Arkansas since Reconstruction. Despite accusations of lacking insight into the concerns of low-income voters, Rockefeller was re-elected in 1968, and went on to complete the integration of Arkansas schools.
In 1968, he was the favorite son of the Arkansas delegation to the 1968 Republican National Convention. It was widely expected that the Arkansas delegates would switch to his brother, New York governor Nelson Rockefeller, on a second ballot. However, Richard Nixon secured the nomination on the first ballot, and the Arkansas delegates switched to Nixon instead.