Joseph Patrick Riley Jr. is an American politician who served as the 60th mayor of Charleston, South Carolina from 1975 to 2016. A member of the Democratic Party, he also served in the South Carolina House of Representatives from 1968 to 1974 and was the 44th President of the United States Conference of Mayors from 1986 to 1987. Riley's 40 years as mayor were the longest in South Carolina history at the time of his retirement and are the longest in Charleston's history.