A90 or A-90 may refer to:
* A-90 Orlyonok, a Soviet model of Ekranoplan
* A90 road, a road connecting Edinburgh and Fraserburgh (both in Scotland)
* A90 TRACON, an FAA Air Traffic Control facility in Merrimack, NH
* Austin A90 motor car, either the Austin Atlantic or Austin Westminster
* Autostrada A90, the orbital motorway that encircles Rome
* Dutch Defence, in the Encyclopaedia of Chess Openings
* Hanlin eReader A90, an ebook reader
* Samsung Galaxy A90 5G, smartphone released in 2019
* Toyota Supra ( A90 ), a sport car from Japanese Automaker, Toyota
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