A21, A-21 or A.21 may refer to:
- a21, Inc., a United States company
- 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
and also :
- One of the Encyclopaedia of Chess Openings codes for the English Opening in chess
- roads
Main article: List of A21 roads
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