The U.S. Marine Corps Forces Korea (abbreviated MARFORK) is the Marine Corps service component of United States Forces Korea and the United Nations Command.

Marines were deployed to Korea at the request of General Douglas MacArthur, the U.S. Commander-in-Chief in the Far East, and fought in the Battle of Inchon and the Battle of Chosin Reservoir.

[2] MARFORK is tasked with coordinating and planning all operational, training, and logistical issues related to Marines in South Korea during peacetime.

In the event of a war, U.S. Marine Corps Forces, Pacific (MARFORPAC) will provide Marine Forces Korea with a full staff for military operations, and MARFORK would oversee the Korean theater of operations.

The title was nominally held by the commander of MARFORPAC, and he was represented in South Korea by a small staff.