William Alexander Harrison (August 17, 1795 – December 31, 1870) was a Virginia lawyer, judge and politician who helped found the state of West Virginia. He represented Harrison County, Virginia in the Virginia House of Delegates for three successive terms before the American Civil War and strongly opposed Virginia's secession. He helped form the new state of West Virginia and served as a circuit court judge during the American Civil War before winning election as one of the first judges of the Supreme Court of Appeals of West Virginia.