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| MOTOR TRANSPORT RESERVE COMPANIES | |
| MOTOR TRANSPORT TRAINING UNITS | |
| MOTOR TRANSPORT UNITS | |
| MOTOR TRANSPORT WORKSHOPS | |
| MOTOR VEHICLE TRADES TRAINING CENTRES | |
| MOUNTAIN BATTERIES | |
| MOVEMENT CONTROL UNITS | |
| MUJAHIDEEN, HEZB-1-ISLAMI AFGHANISTAN (HIA) | |
| MURCHISON PRISONER OF WAR CAMP GROUP | |
| MYRTLEFORD PRISONER OF WAR CAMP | |
N unit names | |
O unit names | |
P unit names | |
Q unit names | |
R unit names | |
S unit names | |
| S HEAVY BATTERY | |
| SA L OF C AREA | |
| SALVAGE UNITS | |
| SALVATION ARMY | |
| SAMF | |
| SANDAKAN PRISONER OF WAR CAMP | |
| SANITARY UNITS | |
| SAS UNITS | |
| SCHOOL CADETS | |
| SCHOOL OF ARTILLERY, HOLSWORTHY | |
| SCOTTISH FORCES | |
| SCOTTISH WOMEN'S HOSPITAL | |
| SEA AMBULANCE UNITS | |
| SEARCHLIGHT UNITS | |