William Cabell (March 13, 1730 – March 23, 1798) was an American statesman, soldier, and politician.
Cabell was born in Licking Hole, Goochland County, Virginia. He was the eldest son of physician and surveyor William Cabell (1699–1774) and Elizabeth Burks Cabell (1705–1756). Home schooled, Cabell joined his father as a vestryman of St. Anne's Parish, Albemarle County, Virginia in 1751, and two years later was officially appointed a surveyor in his own right.
Cabell married Margaret Jordan in 1756, the same year he began his political career as a delegate in the House of Burgesses. He continuously served in successive assemblies until Lord Dunmore suppressed that legislative body just before the American Revolutionary War. Cabell joined the Albermarle County militia in 1756 and two years later became a commissioner for arranging military claims concerning the French and Indian War, hence his honorific, Colonel.
In 1761, the House of Burgesses created Amherst County from part of Albermarle County. The following year, William Cabell received 1,785 acres of his inheritance early, and began establishing what would become his "Union Hill" plantation. Beginning in 1765, Amherst County voters then elected Col. Cabell as their delegate to all legislative assemblies until 1789, including serving on the local Committee of Safety during the revolutionary struggle. William Cabell served as the presiding justice for Amherst County beginning in 1777, and became the first state senator for what was then the 8th district.
In 1788 Amherst County voters overwhelmingly elected Col. Cabell and his eldest son Samuel J. Cabell to represent them in the Virginia Ratification Convention (with 327 and 317 votes respectively, the next candidate receiving 23 votes), where both Cabells voted against the proposed United States Constitution, although the convention as a whole ratified it. William Cabell then became a member of the committee that drew up the Declaration of Rights of January 7, 1789. Col. Cabell also served as one of the presidential electors who voted for George Washington as the first President of the United States, and as trustee of Hampden–Sydney College where his sons studied.