3rd Artillery Regiment

• 3rd (Ulster) Searchlight Regiment, Royal Artillery
• 3rd Air Defense Artillery Regiment
• 3rd Anti-Aircraft Artillery Regiment "Firenze"
• 3rd Artillery Regiment "Pistoia"
• 3rd Continental Artillery Regiment
• 3rd Field Artillery Regiment (Canada)
• 3rd Field Artillery Regiment (Denmark)
• 3rd Field Artillery Regiment (Mountain)
• 3rd Field Artillery Regiment (United States)
• 3rd Field Regiment, Royal New Zealand Artillery
• 3rd Heavy Artillery Regiment "Volturno"
• 3rd Marine Artillery Regiment (France)
• 3rd Massachusetts Heavy Artillery Regiment
• 3rd Medium Regiment, Royal Canadian Artillery
• 3rd Middlesex Artillery Volunteers
• 3rd Pennsylvania Heavy Artillery Regiment
• 3rd Regiment Royal Horse Artillery
• 3rd Rhode Island Heavy Artillery Regiment
• 3rd Targeting Support Regiment "Bondone"
• 3rd West Lancashire Artillery
• III Brigade, Royal Horse Artillery
• III Brigade, Royal Horse Artillery (T.F.)