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Meanings and definitions for R21

HMAS 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 Navy
R21 (New York City Subway car)
R21 road (Senegal)
R21 road (South Africa)
Renault 21, a large family car produced between 1986 and 1994
R21: 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