A39 or A-39 may refer to:
Roads A39 highway (Australia), a road in Victoria designated A39/B340 A39 motorway (France), a road connecting Dijon with Dole and Bourg en Bresse A 39 motorway (Germany), a road connecting Salzgitter, Wolfsburg and Braunschweig A39 road (England)
Other uses Tortoise heavy assault tank, a British experimental tank in World War 2 Ak-Chin Regional Airport (FAA identifier A39) English Opening, Encyclopaedia of Chess Openings code