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