An amphibious command ship (LCC) of the United States Navy is a large, special-purpose ship, originally designed to command large amphibious invasions.

She was designed as an amphibious force flagship, a floating command post with advanced communications equipment and extensive combat information spaces to be used by the amphibious forces commander and landing force commander during large-scale operations.

In World War II this type of ship was termed Amphibious Force Flagship (AGC).

It was not a specific ship class, but rather one that had appropriate radio capabilities and space for command operations.

The original meaning of AGC was based on the General Auxiliary class of miscellaneous unclassified vessels AG and sub-class C, with 3 possible meanings; Command, Control, or Communications, but it became an anacronym, since all AGCs were called Amphibious Force Flagships.