R12 may refer to:
Automobiles BMW R12, a motorcycle Renault 12, a French family car
Aviation Bell R-12, an American utility helicopter Caudron R.12, a French experimental biplane Republic XR-12 Rainbow, an American experimental reconnaissance aircraft R-12 Kassel/Rothwesten, a former United States Army Air Corps airfield in Germany Rubik R-12 Kevély, a Hungarian training glider Yakovlev R-12, a Soviet prototype reconnaissance aircraft
Roads R12 road (Belgium) R12 road (Ghana) R-12 regional road (Montenegro) R12 road (Russia)
Public transport R12 (New York City Subway car) R12 (Rodalies de Catalunya), a regional rail line in Catalonia, Spain Kenilworth Avenue Line of the Washington Metropolitan Area Transit Authority
Vessels , a destroyer of the Royal Navy , an aircraft carrier of the Royal Navy , a submarine of the Royal Navy , a submarine of the United States Navy
Other uses R12 (cemetery), a Neolithic cemetery in Sudan Dichlorodifluoromethane, a refrigerant Ndombe language R-12 Dvina, a Soviet ballistic missile R12: Extremely flammable, a risk phrase Small nucleolar RNA R12