101st Regiment
- 101st (Northumbrian) Regiment Royal Artillery
- 101st Battalion (disambiguation)
- 101st Brigade (disambiguation)
- 101st Cavalry Regiment
- 101st Division (disambiguation)
- 101st Field Artillery Regiment
- 101st Fighter-Training Aviation Regiment
- 101st Grenadiers
- 101st Illinois Volunteer Infantry Regiment
- 101st Indiana Infantry Regiment
- 101st Infantry Regiment (United States)
- 101st Regiment "Edmonton Fusiliers"
- 101st Regiment of Foot (disambiguation)
- 101st Squadron (disambiguation)
- Führer Grenadier Brigade