USS Iwo Jima (LPH-2) was the lead ship of her class and type and the first amphibious assault ship to be designed and built from the keel up as a dedicated helicopter carrier. She carried helicopters and typically embarked USMC elements of a Marine Amphibious Unit (MAU)/later Marine Expeditionary Unit (MEU) principally the Aviation Combat Element (ACE) to conduct heliborne operations in support of an amphibious operation. There was no well deck to support landing craft movement of personnel or equipment to/from shore. Iwo Jima was the second of three ships of the United States Navy to be named for the Battle of Iwo Jima, although the first to be completed and see service.

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".