R12

• BMW R12, a motorcycle
• Renault 12, a French family car

• 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

• R12 road (Belgium)
• R12 road (Ghana)
• R-12 regional road (Montenegro)
• R12 road (Russia)

• 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

• {{HMS|Contest|R12}}, a destroyer of the Royal Navy
• {{HMS|Hermes|R12}}, an aircraft carrier of the Royal Navy
• {{HMS|R12}}, a submarine of the Royal Navy
• {{USS|R-12|SS-89}}, a submarine of the United States Navy

• 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

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