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. He served as Speaker of the Pennsylvania House of Representatives, President of the Pennsylvania Supreme Executive Council and the first Governor of Pennsylvania.