A9
- 9A (disambiguation)
- A-9 Vigilance
- A9 (band)
- A9 (classification)
- A9 TV
- A9.com
- A9home
- ATC code A09
- Aggregate (rocket family)
- Apple A9
- Arrows A9
- Biolimus A9
- Breda A.9
- British NVC community A9
- CallAir A-9
- Chery Fulwin A9
- Cruiser Mk I (A9)
- Georgian Airways
- Gibson Guitar Corporation product list
- Grumman Goose
- HLA-A9
- HMS A9
- Hanlin eReader A9
- ISO 216
- List of A9 roads
- Lockheed A-9
- Northrop YA-9
- Rhodopsin-like receptors
- Réti Opening
- Staff (military)