Alexander Gillon (August 13, 1741 – October 6, 1794) was an American merchant and seaman from Charleston, South Carolina.

He became a sea captain and in 1765 sailed to Charleston, South Carolina, in the brigantine Surprize.

While in Charleston Gillon married Mrs. Mary Cripps, a widow from Kent residing in the city.

He was a delegate to the Second Provincial Congress of South Carolina in 1775 and 1776 and was a member of the first general assembly in 1776.

In 1781 the South Carolina, manned by American officers and a group of European seamen and marines, sailed across the Atlantic toward Charleston.

At Havana, after negotiations between Gillon and the Spanish, the South Carolina joined a force of 59 vessels sent to capture the British colony of New Providence in the Bahamas.

He was buried in the family burial ground at the plantation “Gillon’s Retreat,” Orangeburg District, Calhoun County, South Carolina.