A17, A 17, A.17 or A-17 may refer to:
- A17 Cutty Sark, a 1930 British Saro aircraft
- A17 road, in several countries
- Aero A.17, a 1922 Czech sailplane
- ARM Cortex-A17, a microprocessor core
- Apple A17, a system on a chip mobile processor designed by Apple
- Samsung Galaxy A17, an Android device developed by Samsung Electronics
- British NVC community A17 (Ranunculus penicillatus ssp. pseudofluitans community), a British Isles plant community
- Focke-Wulf A 17, an airliner
- Northrop A-17, an aircraft
- One of the Encyclopaedia of Chess Openings codes for the English Opening in chess
- Subfamily A17, a rhodopsin-like receptors subfamily