| Abbreviation | Definition |
|---|---|
| AALC | Amphibious Assault Landing Craft |
| AB | Airboat |
| AB | Crane Ship (Auxiliary, Boom) |
| ABSD | Advanced Base Sectional Dock |
| AC | Collier (Auxiliary, Coal) |
| ACC | aircraft carrier |
| ACPB | Armidale Class Patrol Boat |
| ACR | Armored Cruiser |
| ACS | Auxiliary Crane Ship |
| AD | Destroyer Tender (Auxiliary, Destroyer) |
| ADG | De-gaussing ship (Auxiliary, DeGaussing) |
| ADS | Air Defence Ship |
| AE | Ammunition ship (Auxiliary, Explosives) |
| AF | All Forward |
| AF | Stores Ship (Auxiliary, Freight) |
| AFD | Admiralty Floating Dock |
| AFDB | Floating Drydock, Large (Auxiliary, Floating Drydock, Big) |
| AFDL | Floating Drydock, Small (Auxiliary, Floating Drydock, Light) |
| AFDM | Floating Drydock, Medium (Auxiliary, Floating Drydock, medium) |
| AFS | Combat Stores Ship (Auxiliary, Freight, Stores) |