64th Regiment
- 64th (2nd Staffordshire) Regiment of Foot
- 64th (Liverpool Irish) Lancashire Rifle Volunteer Corps
- 64th (Queen's Own Royal Glasgow Yeomanry) Anti-Tank Regiment, Royal Artillery
- 64th Armor Regiment
- 64th Division (disambiguation)
- 64th Illinois Volunteer Infantry Regiment
- 64th Infantry Regiment (United States)
- 64th New York Volunteer Infantry Regiment
- 64th Ohio Infantry
- 64th Squadron (disambiguation)
- 64th United States Colored Infantry Regiment
- 64th Virginia Mounted Infantry
- British Army
- British Territorial Army
- Loudon's Highlanders
- US Army
- Yeomanry