R20 may refer to:

Roads

Small Ring, Brussels The Small Ring (french: Petite Ceinture, nl, Kleine Ring) inner ring road, formally R20 and N0 is a series of roadways in central Brussels, Belgium, surrounding the historic city centre. The city centre is usually defined as the area within t ...

, a ring road in Belgium

Other uses

Chloroform Chloroform, or trichloromethane, is an organic compound with chemical formula, formula Carbon, CHydrogen, HChlorine, Cl3 and a common organic solvent. It is a colorless, strong-smelling, dense liquid produced on a large scale as a precursor to ...

, 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 The R20 – Regions of Climate Action is a non-profit environmental organization founded in September 2011, by former governor of California, Arnold Schwarzenegger, with the support of the United Nations. R20 is a coalition of sub-national governm ...

, a nonprofit environmental organization * R20 series, preferred numbers in industrial design *

Renault 20 The Renault 20 ''(R20)'' and Renault 30 ''(R30)'' are two executive cars produced by the French automaker Renault between 1975 and 1984. The most upmarket and expensive Renaults of their time, the two cars were almost identical with regard to she ...

, a French executive car * Small nucleolar RNA R20 * Toyota TownAce (R20), a Japanese van * , a 1918 submarine of the United States Navy {{Letter-NumberCombDisambig