Infantry Regiments
- 101st Grenadiers, a unit of the army of British India
- 101st Infantry Regiment (Philippine Commonwealth Army), a unit of the Philippine Commonwealth Army
- 101st (Northumbrian) Regiment Royal Artillery (Volunteers), a unit of the United Kingdom Army
- 101st Regiment of Foot (Royal Bengal Fusiliers), a unit of the United Kingdom Army
- 101st Regiment of Foot (1760), a unit of the United Kingdom Army
- 101st Infantry Regiment (United States)
- 101st Regiment "Edmonton Fusiliers", a unit of Canada's Non-Permanent Active Militia from 1908 to 1920
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