G12 may refer to:
Vehicles EMD G12, an American diesel locomotive Fiat G.12, an Italian transport aircraft , a Royal Navy G-class submarine , a Royal Navy S-class destroyer Matchless G12, a British motorcycle Prussian G 12, a Prussian steam locomotive , a German V1-class torpedo boat
People "G12", a nickname for basketball player Ja Morant
Other uses G12 (postcode), covering most of the West End of Glasgow G-12 (Brazilian football), a group of Brazilian football clubs G12 Hunchun–Ulanhot Expressway in China G12 Vision, a Colombian Christian movement Canon PowerShot G12, a digital camera County Route G12 (California) Group of Twelve, an intergovernmental organization