A20, A 20, A.20 or A-20 may refer to:

• A20 line, a microprocessor connection
• British NVC community A20 (Ranunculus peltatus community), a plant community

Roads

List of A20 roads

Vehicles

• A-20 Havoc, a U.S.-designed attack aircraft used in World War II
• A20 heavy tank, a British tank which did not enter production but of which a downsized version became the A22 Churchill tank
• A-20 tank, a one of prototypes of Soviet T-34 tank
• Aero A.20, a Czech fighter plane
• Arrows A20, a race car
• Fiat A.20, an engine powering the 1925 Italian Ansaldo A.120 aircraft
• Focke-Wulf A 20, a 1927 German airliner
• Junkers A 20, a predecessor of the Junkers A 35 aircraft

Others

• A20, another name for the TNFAIP3 human gene or a deubiquitine ligase cut by the paracaspase
• A20, a code in the Encyclopedia of chess openings for the English Opening
• A20, the UCAS institution code for the University of Aberdeen
• A-20, a character in the Japanese .hack//Sign anime, whose voice is given by Atsuko Enomoto
• A 20, Oshiage Station code, a train station in Sumida, Tokyo, Japan

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