R20 may refer to:
Roads R-20 regional road (Montenegro) Small Ring, Brussels, a ring road in Belgium
Other uses Chloroform, a refrigerant , 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 The LMT R-20 Rahe is an assault rifle of EDF made by LMT Toyota TownAce (R20), a Japanese van , a 1918 submarine of the United States Navy