53rd Regiment

• 53rd (City of London) Heavy Anti-Aircraft Regiment, Royal Artillery
• 53rd (Napier's) Regiment of Foot
• 53rd (Shropshire) Regiment of Foot
• 53rd Anti-Aircraft Missile Regiment (Romania)
• 53rd Coast Artillery Regiment
• 53rd Division (disambiguation)
• 53rd Illinois Infantry Regiment
• 53rd Indiana Infantry Regiment
• 53rd Infantry Regiment (Imperial Japanese Army)
• 53rd Infantry Regiment (United States)
• 53rd Ohio Infantry
• 53rd Pennsylvania Infantry Regiment
• 53rd Regiment Alabama Cavalry
• 53rd Regiment Kentucky Volunteer Mounted Infantry
• 53rd Regiment Massachusetts Volunteer Infantry
• 53rd Sikhs (Frontier Force)
• 53rd Wisconsin Volunteer Infantry Regiment