Samuel Dexter, American lawyer and politician, 4th United States Secretary of War, 3rd United States Secretary of the Treasury (died 1816)

Samuel Dexter was an early American statesman who served both in Congress and in the Presidential Cabinets of John Adams and Thomas Jefferson. A native of Boston, Massachusetts, Dexter was a 1781 graduate of Harvard College. After receiving his degree he studied law, attained admission to the bar in 1784, and began to practice in Lunenburg, Massachusetts.

The secretary of war was a member of the U.S. president's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War", had been appointed to serve the Congress of the Confederation under the Articles of Confederation between 1781 and 1789. Benjamin Lincoln and later Henry Knox held the position. When Washington was inaugurated as the first President under the Constitution, he appointed Knox to continue serving as Secretary of War.

The United States secretary of the treasury is the head of the United States Department of the Treasury, and is the chief financial officer of the federal government of the United States. The secretary of the treasury serves as the principal advisor to the president of the United States on all matters pertaining to economic and fiscal policy. The secretary is, by custom, a member of the president's cabinet and, by law, a member of the National Security Council, and fifth in the U.S. presidential line of succession.