A21
A21, A-21 or A.21 may refer to:
- A21 Cocktail Lounge, acclaimed to be one of the world´s best bars
- a21, Inc., a United States company
- A-21 water-alcohol-fuel emulsion developed by American inventor Rudolf W. Gunnerman
- Aero A.21, a 1920s-era Czechoslovakian military aeroplane
- Arrows A21, a Formula One car
- British NVC community A21 (Ranunculus baudotii community), a plant community
- Focke-Wulf A 21, a photographic survey variant of the 1927 German Focke-Wulf A 17
- Stearman XA-21 twin engined United States attack bomber
and also:
- One of the Encyclopaedia of Chess Openings codes for the English Opening in chess
For roads numbered as A21, see List of A21 roads.
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