The V Amphibious Corps (VAC) was a formation of the United States Marine Corps which was composed of the 3rd, 4th and 5th Marine Divisions in World War II.

The three divisions were the amphibious landing force for the United States Fifth Fleet with two goals, removal of Japanese forces from islands so U.S. Seabees could build advance bases to project US power.

In doing this VAC was notably involved in the battles for Tarawa, Saipan, and Iwo Jima.

The V Amphibious Corps (formerly Amphibious Corps, Pacific Fleet; ACPF) was formed on 25 August 1943 at Camp Elliot, California.

The structure of a United States Marine Corps' amphibious corps by 1945, was broken down into four major subordinate commands with each of them having numerous sub-elements: The US Marine Corps, US Army, and Naval Construction Force commands that served under the V Amphibious Corps in World War II include:[2] A unit citation or commendation is an award bestowed upon an organization for the action cited.