38th Regiment
- 38 (City of Sheffield) Signal Regiment
- 38 Squadron (disambiguation)
- 38th (1st Staffordshire) Regiment of Foot
- 38th Alabama Infantry Regiment
- 38th Brigade (disambiguation)
- 38th Cavalry Regiment
- 38th Division (disambiguation)
- 38th Dogras
- 38th Field Artillery Regiment
- 38th Field Regiment (New Zealand)
- 38th Illinois Infantry Regiment
- 38th Indiana Infantry Regiment
- 38th Infantry Regiment "Neagoe Basarab"
- 38th Infantry Regiment (United States)
- 38th Iowa Infantry Regiment
- 38th Massachusetts Infantry Regiment
- 38th Ohio Infantry Regiment
- 38th Regiment Central India Horse
- 38th Tennessee Infantry Regiment
- 38th United States Colored Infantry Regiment
- 38th Virginia Infantry
- 38th Wing (disambiguation)
- 38th Wisconsin Infantry Regiment
- New Zealand Army