A37, A 37, A.37 or A-37 may refer to:

Roads

* A37 road (England), a road connecting Dorchester, Dorset and Bristol * A37 road (South) (Northern Ireland), a short road connecting the N53 road in the Republic of Ireland, which is the main road between Castleblaney and Dundalk * A37 road (North) (Northern Ireland), a road connecting Coleraine and Limavady * A 37 motorway (Germany), a road connecting the borough of Hannover-Buchholz and Burgdorf via Altwarmbüchen and the Hanover fairground to the A7 * A37 road (Isle of Man), or ''Marine Drive Road'' * A37 motorway (Netherlands), a road connecting Hoogeveen with Emmen and the German border near Zwartemeer * A-37 (Michigan county highway), a road in Michigan connecting Allegan and Hudsonville

Other

* A37, one of the English Opening codes in the Encyclopaedia of Chess Openings * Cessna A-37 Dragonfly, a light attack jet aircraft * Saunders Roe A.37 Shrimp, a 1939 British two-seat four-engined experimental flying boat {{Letter-NumberCombDisambig