27th Battalion
- 2/27th Battalion (Australia)
- 27 Infantry Battalion (Ireland)
- 27 Squadron (disambiguation)
- 27e bataillon de chasseurs alpins
- 27th Army (disambiguation)
- 27th Battalion (Australia)
- 27th Battalion (City of Winnipeg), CEF
- 27th Battalion Virginia Partisan Rangers
- 27th Brigade (disambiguation)
- 27th Division (disambiguation)
- 27th Engineer Battalion (United States)
- 27th Jäger Battalion (Finland)
- 27th Machine-Gun Battalion (New Zealand)
- 27th Regiment (disambiguation)
- XXVII Corps (disambiguation)