R20

R20 may refer to:

Roads

 * R-20 regional road (Montenegro)
 * Small Ring, Brussels, a ring road in Belgium

Other uses

 * Chloroform, a refrigerant
 * HMCS Crusader (R20), a destroyer of the Royal Canadian Navy and Royal Navy
 * R20: Harmful by inhalation, a risk phrase
 * R20 battery, a dry cell battery
 * R20 Regions of Climate Action, a nonprofit environmental organization
 * R20 series, preferred numbers in industrial design
 * Renault 20, a French executive car
 * Small nucleolar RNA R20
 * Toyota TownAce (R20), a Japanese van
 * USS R-20 (SS-97), a 1918 submarine of the United States Navy