223rd
- 223 (disambiguation)
- 223rd (2nd London) Field Park Company, Royal Engineers
- 223rd (Banffshire) Medium Battery, Royal Artillery
- 223rd (Devon) Field Battery, Royal Artillery
- 223rd Anti-aircraft Missile Regiment (Ukraine)
- 223rd Aviation Regiment (United States)
- 223rd Battalion (Canadian Scandinavians), CEF
- 223rd Brigade (United Kingdom)
- 223rd Brigade Royal Field Artillery
- 223rd Coastal Division (Italy)
- 223rd Cyberspace Operations Squadron
- 223rd Engineer Battalion (United States)
- 223rd Flight Unit
- 223rd Independent Infantry Brigade (Home)
- 223rd Infantry Division
- 223rd Infantry Regiment (United States)
- 223rd Military Intelligence Battalion (United States)
- 223rd Mixed Brigade (Spain)
- 223rd Rifle Division