A3
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A3 or A-3 may refer to:
- A3, an international standard paper size (297×420 mm) defined by ISO 216.
- The A3 road in Southern England, connecting London to Portsmouth.
- The A3 expressway in Switzerland.
- The A3 Highway, a toll-free highway in Italy.
- The Audi A3, a brand of car.
- A3, a German rocket design during World War II
- The Douglas A-3 Skywarrior strategic bomber.
- HMS A3, an A-class submarine of the Royal Navy.
- USS A-3, a Plunger-class submarine of the United States Navy.
- A3, the United States alias of the London band Alabama 3 (having been sued by Alabama).
- A-3, a programming language, later known as ARITH-MATIC.
- Alien Adopt Agency, an online game.
- A-3, the former name of Alpha Trion, a character in the Transformers Series.