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| CITY OF GEELONG REGIMENT | |
| CITY OF MELBOURNE REGIMENT | |
| CITY OF NEWCASTLE REGIMENT | |
| CITY OF PERTH REGIMENT | |
| CITY OF SYDNEY REGIMENT | |
| CIVIL DEFENCE ORGANISATIONS | |
| CIVILIAN LABOUR UNITS | |
| CLEARANCE DIVING TEAMS | |
| CLUBS | |
| COASTWATCHERS | |
| COBB FORCE | |
| COCKATOO ISLAND DOCKYARD | |
| COLONIAL MILITARY FORCES | |
| COMMANDERS, ROYAL ENGINEERS (WORKS) | |
| COMMANDO UNITS | |
| COMMONWEALTH AIRCRAFT CORPORATION | |
| COMMONWEALTH CEASEFIRE MONITORING FORCE (ZIMBABWE - RHODESIA) | |
| COMMONWEALTH CLOTHING FACTORY | |
| COMMONWEALTH HORSE | |
| COMMONWEALTH MILITARY TRAINING TEAM, UGANDA | |
| COMMONWEALTH NAVAL FORCES (AMALGAMATED COLONIAL NAVAL FORCES FROM 1901 TO FORMATION OF RAN IN 1911) | |
| COMMONWEALTH ORDNANCE FACTORY | |
| COMMONWEALTH WAR GRAVES COMMISSION | |
| COMPANIES, AUSTRALIAN ARMY SERVICE CORPS | |
| COMPOSITE ANTI AIRCRAFT REGIMENTS | |
| CONCERT PARTIES | |
| CONSTRUCTION SQUADRONS (ENGINEERS) | |
| CONVALESCENT DEPOTS | |
| CONVALESCENT HOMES | |
| | BT MEDICAL UNITS | |