R21

R21, R-21 or R.21 may refer to:

Military

• R-21 (missile), a Soviet submarine-launched ballistic missile
• HMAS Melbourne (R21), an aircraft carrier of the Royal Australian Navy
• HMS Chivalrous (R21), a destroyer of the Royal Navy
• USS R-21 (SS-98), a submarine of the United States Navy
• Yugoslav destroyer Kotor

Roads

• R-21 regional road (Montenegro)
• R21 (South Africa)
• R21 highway (Russia)

Science and medicine

• Dichlorofluoromethane, a refrigerant
• R21: Harmful in contact with skin, a risk phrase
• R21/Matrix-M a Malaria vaccine
• Small nucleolar RNA R21

Other uses

• R21 (New York City Subway car)
• Kwanyama dialect
• Renault 21, a French family car
• Tumansky R-21, a Soviet turbojet engine

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