Olin Township is a non-functioning administrative division of Iredell County, North Carolina, United States. By the requirements of the North Carolina Constitution of 1868, the counties were divided into townships, which included Olin township.

Iredell County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 186,693. Its county seat is Statesville, and its largest community is Mooresville. The county was formed in 1788, subtracted from Rowan County. It is named for James Iredell, one of the first justices of the Supreme Court. Iredell County is included in the Charlotte-Concord-Gastonia, NC-SC Metropolitan Statistical Area, as defined by the Office of Management and Budget, with data from the U.S. Census Bureau.