39th Regiment
- 2/39 Evzone Regiment
- 39 Engineer Regiment (United Kingdom)
- 39th (Dorsetshire) Regiment of Foot
- 39th Battalion (disambiguation)
- 39th Brigade (disambiguation)
- 39th Division (disambiguation)
- 39th Illinois Volunteer Infantry Regiment
- 39th Infantry Regiment (United States)
- 39th Iowa Volunteer Infantry Regiment
- 39th New Jersey Volunteer Infantry
- 39th New York Volunteer Infantry Regiment
- 39th Regiment Royal Artillery
- 39th Squadron (disambiguation)
- 39th United States Infantry
- 39th Wisconsin Volunteer Infantry Regiment
- Central India Horse (21st King George V's Own Horse)
- The Garhwal Rifles