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R21, R-21 or R.21 may refer to:In militaryHMAS Melbourne (R21), a 1945 Australian Royal Navy ship of the Majestic class of light aircraft carrier R-21 (missile), a submarine-launched ballistic missile developed and deployed by the Soviet Union USS R-21 (SS-98), a 1918 R-class coastal and harbor defense submarine of the United States NavyIn transportationR21 R21 road (Senegal) R21 road R21 highway (Russia) Renault 21, a large family car produced between 1986 and 1994In science and academiaR21: Harmful in contact with skin, a risk phrase in chemistry Dichlorofluoromethane, a hydrochlorofluorocarbon used as a propellant and refrigerant NIH Exploratory/Developmental Research Grant Award, a type of United States National Institute of Health grant   Wikipedia

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