Thomas Mifflin (January 10, 1744January 20, 1800) was an American merchant and politician from Philadelphia, Pennsylvania. He was a major general in the Continental Army and the 1st and 3rd Quartermaster General during the American Revolution, a member of the Pennsylvania Provincial Assembly, a Continental Congressman from Pennsylvania, President of the Continental Congress, and a delegate to the Constitutional Convention of 1787. Several of these activities qualify him to be counted among the Founding Fathers. He served as Speaker of the Pennsylvania House of Representatives, President of the Pennsylvania Supreme Executive Council and the first Governor of Pennsylvania.