The Nitro-class ammunition ships are a class of three auxiliary vessels of the United States Navy.

Launched in 1958-1959, they were among the first specialized underway replenishment ships built after the Second World War, to carry munitions.

Soon after completion, all ships of the class were modified to stow surface to air missiles as large as the RIM-8 Talos in their holds.

Initially ships of the Nitro class were armed with eight 3"/50 caliber guns in Mk 33 twin mounts.

During the mid-1960s all ships of the class had the two Mk 33 mounts near the stern replaced with a helicopter landing pad.