The history of the United States Marine Corps (USMC) begins with the founding of the Continental Marines on 10 November 1775 to conduct ship-to-ship fighting, provide shipboard security and discipline enforcement, and assist in landing forces. Its mission evolved with changing military doctrine and foreign policy of the United States. Owing to the availability of Marine forces at sea, the United States Marine Corps has served in nearly every conflict in United States history. It attained prominence when its theories and practice of amphibious warfare proved prescient, and ultimately formed a cornerstone of U.S. strategy in the Pacific Theater of World War II. By the early 20th century, the Marine Corps would become one of the dominant theorists and practitioners of amphibious warfare. Its ability to rapidly respond on short notice to expeditionary crises has made and continues to make it an important tool for U.S. foreign policy.

The Continental Marines were the amphibious infantry of the American Colonies during the American Revolutionary War. The Corps was formed by the Continental Congress on November 10, 1775 and was disbanded in 1783. Their mission was multi-purpose, but their most important duty was to serve as onboard security forces, protecting the captain of a ship and his officers. During naval engagements, in addition to manning the cannons along with the crew of the ship, Marine sharpshooters were stationed in the fighting tops of a ship's masts specifically to shoot the opponent's officers, naval gunners, and helmsmen.