USS Guam (LPH-9), was an Iwo Jima-class amphibious assault ship, and was laid down by the Philadelphia Naval Shipyard on 15 November 1962; launched on 22 August 1964, sponsored by Mrs. Vaughn H. Emory Green, and commissioned on 16 January 1965. She was the third US Navy ship to carry the name, after the US Territory of Guam.

The Iwo Jima-class amphibious assault ships of the United States Navy were the first amphibious assault ships designed and built as dedicated helicopter carriers, capable of operating up to 20 helicopters to carry up to 1,800 marines ashore. They were named for battles featuring the United States Marine Corps, starting with the Battle of Iwo Jima. The first ship of the class was commissioned in 1961, and the last was decommissioned in 2002. The hull classification of "LPH" stands for "Landing Platform Helicopter".