R20

R20 may refer to:

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

• 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
• The LMT R-20 Rahe is an assault rifle of EDF made by LMT
• Toyota TownAce (R20), a Japanese van
• USS R-20 (SS-97), a 1918 submarine of the United States Navy