A39 or A-39 may refer to:

• 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)
• Tortoise heavy assault tank, a British experimental tank in World War 2
• the FAA identifier for Phoenix Regional Airport

and also :

• One of the Encyclopaedia of Chess Openings codes for the English Opening in chess

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