86th Regiment

• 86th (Cornwall) Medium Regiment, Royal Artillery
• 86th (East Anglian) (Hertfordshire Yeomanry) Field Regiment, Royal Artillery
• 86th (Honourable Artillery Company) Heavy Anti-Aircraft Regiment, Royal Artillery
• 86th (Royal County Down) Regiment of Foot
• 86th Armoured Regiment (India)
• 86th Brigade (disambiguation)
• 86th Division (disambiguation)
• 86th Field Artillery Regiment
• 86th Guards Fighter Aviation Regiment
• 86th Illinois Volunteer Infantry Regiment
• 86th Indiana Infantry Regiment
• 86th Infantry Regiment (United States)
• 86th New York Volunteer Infantry
• 86th Ohio Infantry
• 86th Regiment of Foot (Rutland Regiment)
• British Army
• British Territorial Army
• Indian Army
• Soviet Air Forces
• United States Army