A
- AALC: Amphibious Assault Landing Craft
- AARCS: Air Raid Report Control Ship
- AASGP: Amphibious Assault Ship, General Purpose
- AB: Crane Ship
- ABU: Boom defense vessel
- AC: Collier
- ACR: Armored Cruiser (pre-1920)
- ACS: Auxiliary Crane Ship
- ACV: Auxiliary Aircraft Carrier (Escort carrier) (1942)
- AD: Destroyer Tender
- ADC: Ammunition Storage Cargo ship
- ADG: Degaussing Ship (ADG = Auxiliary Degaussing General)
- ADS: Air Defense Ship
- AE: Ammunition Ship
- AEFS: Fleet replenishment ship
- AEM: Ammunition Ship, Missile (retired)
- AF: Refrigerated ship
- AFDB: Large Auxiliary Floating Dry Dock
- AFDL: Small Auxiliary Floating Dry Dock
- AFDM: Medium Auxiliary Floating Dry Dock
- AFDS: Auxiliary Fighter Directing Ship
- AFS: Combat Stores Ship
- AG: Miscellaneous Auxiliary (AG = Auxiliary General)
- AGB: Icebreaker
- AGCL: Auxiliary General Communication (ship), Light
- AGD: Degaussing Ship
- AGDE: Testing Ocean Escort
- AGDS: Deep Submergence Support Ship
- AGE: General Purpose Experimental Ship (AGE = Auxiliary General Experimental)
- AGER: Environmental Research Ship
- AGF: Miscellaneous Command Ship
- AGFF: Testing Frigate
- AGH: Weather Ship (AGH = Auxiliary General Hydrometeorology)
- AGHS: Hydroplane research ship
- AGI: Intelligence Collecting Ship (AGI = Auxiliary General Intelligence)
- AGM: Missile Range Instrumentation Ship
- AGMR: Auxiliary Major Communication Relay Ship
- AGOR: Oceanographic Research Ship
- AGOS: Ocean Surveillance Ship
- AGP: Patrol Craft Tender
- AGR: Radar Picket Ship (retired)
- AGS: Surveying Ship
- AGSL: Auxiliary General Satellilte Launching ship
- AGSS: Auxiliary Submarine
- AGT: Target ship (AGT = Auxiliary General Target)
- AGTR: Technical research ship
- AH: Hospital ship
- AHC: Auxiliary Helicopter Carrier
- AHP: Medical Evacuation Ship
- AIRIS: Aviation store issue ship
- AK: Cargo Ship
- AKA: Attack Cargo Ship
- AKB: Cargo Ship, Barge
- AKD: Cargo Ship, Dock (cargo dock ship)
- AKE: Underway Replenishment Dry Cargo Ship
- AKF: Float-on/Float-off (flo-flo) Ship
- AKFBM: Fleet ballistic missile trial ship
- AKL: Cargo Ship, Light
- AKN: Cargo Ship, Net
- AKR: Vehicle Cargo Ship (Cargo Ship, Roll-on/Roll-off)
- AKS: Store Issue Ship
- AKV: Cargo Ship, Aircraft Transport
- AKX: Container ship
- AL: Auxiliary Lighter
- AM: Minesweeper or MCM tender
- AMb: Harbor Minesweeper
- AMc: Coastal Minesweeper
- AMCU: Underwater Mine Locater
- AN: Net Laying Ship
- AO: Fleet Oiler
- AOE: Fast Combat Support Ship
- AOG: Gasoline Tanker
- AOR: Replenishment Oiler
- AOS: Specialized Oiler/Tanker
- AOSS: Submarine Oiler (retired)
- AOT: Transport/Storage Oiler
- AP: Transport
- APA: Attack Transport
- APB: Self-Propelled Barracks Ship
- APC: Transport, Coastal
- APD: High Speed Transport
- APF: Administrative flagship
- APG: Coastal artillery supply ship
- APH: Ambulance Transport
- APL: Barracks Craft
- APP: Troop Barge
- APR: Cargo ship, rescue / med evac
- APS: Minelaying Submarine (retired)
- APSS: Transport Submarine (retired)
- APT: Troop transport
- APV: Aircraft transport
- APY: Large Y-boat (large Rigid-hulled inflatable boat)
- AR: Repair ship
- ARB: Repair Ship, Battle damage
- ARC: Cable Repair Ship
- ARD: Auxiliary Repair Dry Dock
- ARDM: Medium Auxiliary Repair Dry Dock
- ARG: Marine engine repair ship
- ARH: Heavy repair ship (ARH = Auxiliary Repair, Heavy)
- ARIS: Space exploration tracking ship
- ARL: Small Repair Ship (ARL = Auxiliary Repair, Light)
- ARM: Heavy machinery repair ship (ARM = Auxiliary Repair, Machinery, heavy)
- ARR: Repair ship, radioactive
- ARS: Rescue/Salvage Ship
- ARDS: Salvage Lifting Ship
- ARST: Auxiliary Rescue Salvage Tender
- ARV: Aircraft repair ship
- ARVA: Aircraft repair ship
- ARVE: Aviation engine repair ship
- ARVH: Helicopter repair ship
- AS: Submarine tender
- ASPB: Assault Support Patrol Boat
- ASR: Submarine Rescue Ship
- ASSP: Transport Submarine (retired)
- AT: Ocean Going Tug
- ATA: Auxiliary Ocean Tug
- ATC: Armored Troop Carrier
- ATF: Fleet Ocean Tug
- ATR: Rescue tug (ATR = Auxiliary Tug, Rescue)
- ATS: Salvage and Rescue Ship
- AV: Seaplane Tender
- AVB: Aviation Logistics Support Ship
- AVC: Large catapult lighter (for launching seaplanes)
- AVD: Seaplane Tender Destroyer (retired)
- AVG: Auxiliary Aircraft Ferry (Escort carrier) (1941-2)
- AVM: Missile trial ship
- AVP: Seaplane Tender, light
- AVS: Helicopter training ship
- AVT: Auxiliary Aircraft Landing Training Ship
- AW: Distilling Ship
- AWT: Water Tanker
- AX: Training ship
- AXS: Training ship, sail
- AXT: Training ship tender
- AZ: Airship Tender (retired)
Read more about this topic: List Of Hull Classifications