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 Apple A18, a system on a chip mobile processor designed by Apple Inc Samsung Galaxy A18, an Android-based smartphone from Samsung Arrows A18, a Formula One car British NVC community A18 (Ranunculus fluitans community), a plant community Cunninghamella A18, a fungus strain English Opening in chess (Encyclopaedia of Chess Openings code A18, among others) 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 Asakusa station of the Toei Subway (station number A18)