A39 or A-39 may refer to:
- Tortoise heavy assault tank, a British experimental tank in World War 2
- The FAA identifier for Ak-Chin Regional Airport
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)
and also:
- English Opening, Encyclopaedia of Chess Openings code
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