27th Regiment
- 27 Squadron (disambiguation)
- 27th (Inniskilling) Regiment of Foot
- 27th Army (disambiguation)
- 27th Battalion (disambiguation)
- 27th Brigade (disambiguation)
- 27th Connecticut Infantry Regiment
- 27th Division (disambiguation)
- 27th Illinois Infantry Regiment
- 27th Indiana Infantry Regiment
- 27th Infantry Regiment (United States)
- 27th Iowa Infantry Regiment
- 27th Kentucky Infantry Regiment
- 27th Lancers
- 27th Maine Infantry Regiment
- 27th Marine Regiment (United States)
- 27th Michigan Infantry Regiment
- 27th New Jersey Infantry Regiment
- 27th New York Infantry Regiment
- 27th New York Volunteer Infantry Regiment (1873)
- 27th Punjabis
- 27th Wisconsin Infantry Regiment
- XXVII Corps (disambiguation)