223rd

• 223rd Brigade (United Kingdom), a Home Defence formation of the British Army during the First World War
• 223rd Independent Infantry Brigade (Home), a Home Defence formation of the British Army during the Second World War
• 223rd Brigade Royal Field Artillery
• 223rd (Banffshire) Medium Battery, Royal Artillery
• 223rd (Devon) Field Battery, Royal Artillery
• 223rd (2nd London) Field Park Company, Royal Engineers

• 223rd Military Intelligence Battalion (United States), California Army National Guard; provides interpreters, translators, counter-intelligence, interrogation and signals intelligence support
• 223rd Cyberspace Operations Squadron, U.S. Air Force
• 223rd Engineer Battalion (United States), U.S. Army
• 223rd Aviation Regiment (United States), U.S. Army
• 223rd Infantry Regiment (United States), U.S. Army

• 223rd Battalion (Canadian Scandinavians), CEF, Canadian Army; a unit in the Canadian Expeditionary Force during the First World War
• 223rd Mixed Brigade (Spain), a unit of the Spanish Republican Army in the Spanish Civil War
• 223rd Coastal Division (Italy), World War II Royal Italian Army
• 223rd Infantry Division, World War II German Wehrmacht
• 223rd Rifle Division, World War II Soviet Red Army
• 223rd Flight Unit, Russian Air Force
• 223rd Anti-aircraft Missile Regiment (Ukraine), Ukrainian Air Force

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• 223 (disambiguation), including units "No, 223"
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