A9
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A9 or A-9 can refer to:
- The A9, a road in Scotland from Edinburgh to Thurso.
- The A9, a motorway in the Netherlands from Diemen to Alkmaar.
- The A9, an expressway in Switzerland.
- A9.com, a website and search engine.
- A9, a German rocket design in World War II, never realized.
- A9, an international standard paper size (37×52 mm) defined in ISO 216.
- A-9, a ground attack aircraft based on the Lockheed YP-24 fighter prototype
- HMS A9, an A-class submarine of the Royal Navy.
- The Grumman G-21 "Goose" amphibious aircraft in USAAC service (later redesignated OA-9)
- The Northrop YA-9, a prototype attack aircraft developed for the USAF.
- The A-9 Vigilance, a fictional starfighter from the Star Wars universe.