John Gibson (May 23, 1740 – April 10, 1822) was a veteran of the French and Indian War, Lord Dunmore's War, the American Revolutionary War, Tecumseh's War, and the War of 1812. A delegate to the first Pennsylvania constitutional convention in 1790, and a merchant, he earned a reputation as a frontier leader and had good relations with many Native American in the region. At age sixty he was appointed the Secretary of the Indiana Territory where he was responsible for organising the territorial government. He served twice as acting governor of the territory, including a one-year period during the War of 1812 in which he mobilized and led the territorial militia to relieve besieged Fort Harrison.