A18 or A-18 is a three-character acronym that may refer to:
- A18 road (disambiguation), in several countries
- A-18 Shrike, a Curtiss Model 76A twin radial engine monoplane service test aircraft of the mid-1930s
- Aero A.18, a Czech fighter aircraft built in the 1920s
- Arrows A18, a Formula One car
- British NVC community A18 (Ranunculus fluitans community), a plant community
- Cunninghamella A18, a fungus strain
- A18, one of the Encyclopaedia of Chess Openings codes for the English Opening in chess
- Subfamily A18, a rhodopsin-like receptors subfamily
- F/A-18 Hornet, an all-weather carrier-based strike fighter designed to fill the roles of fighter aircraft and attack aircraft
- Station number of Toei Subway Asakusa station
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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