| Term / Abbreviation | Name |
|---|---|
| CMO | Court-Martial Officer |
| CMP | Corps of Military Police |
| CO | Commanding Officer, Conscientious Objector |
| COO | Chief Ordnance Officer |
| COY | Field Company |
| CP | Censorship & Publicity |
| CPL | Corporal |
| CQMS | Company Quartermaster Sergeant |
| CRA | Commanding Royal Artillery |
| CRCE | Chief Railway Construction Engineer |
| CRE | Commanding Royal Engineers |
| CRO | Corps Roads Officer |
| CSIC | Cadet School Infantry Company |
| CSM | Company Sergeant Major |
| CT | Communication Trench |
| CVBC | Cape Volunteer Bearer Corps |
| CWGC | Commonwealth War Graves Commission |
| Term / Abbreviation | Name |