| AG | General Auxiliary (Auxiliary, General) |
| AGB | Icebreaker (Auxiliary, General, Icebreaker) |
| AGC | Command Ship (Auxiliary, General, Command) |
| AGDE | Destroyer Escort Research ship (Auxiliary, General, Destroyer Escort) |
| AGEH | Hydrofoil Research Ship (Auxiliary, General, Experimental, Hydrofoil) |
| AGER | Environmental Research Ship (Auxiliary, General, Environmental Research) |
| AGF | Amphibious Force Command Ship (Auxiliary, General, Force command) |
| AGI | Intellligence Collector ship (Auxiliary, General, Intelligence) |
| AGM | Missile Range Instrumentation ship (Auxiliary, General, Missile) |
| AGOS | Ocean Surveillance ship (Auxiliary, General, Ocean Surveillance) |
| AGP | Motor Torpedo Boat Tender |
| AGR | Radar Picket Ship (Auxiliary, General, Radar) |
| AGRM | Major Communications Relay Ship (Auxiliary, General, Relay, Major communications) |
| AGS | Survey Ship (Auxiliary, General, Survey) |
| AGTR | Technical Research Ship (Auxiliary, General, Technical Research) |
| AH | Hospital Ship (Auxiliary, Hospital) |
| AHL | Australian Hold Ladder |
| AHT | Anchor Handling Tugboats |
| AHTS | Anchor Handling Tug Supply vessel |
| AK | Cargo Ship (Auxiliary, Kargo) |