N9

N9 may refer to:

Roads

 * N9 road (Belgium), a road connecting Brussels and Ostend, passing Aalst, Ghent, Eeklo and Bruges (see nl:N9 (België))
 * N9 road (France)
 * N9 road (Ireland)
 * N9 road (Netherlands), a road connecting Alkmaar and De Kooy
 * N9 road (South Africa), a road connecting George and Colesberg
 * N9 road (Switzerland)
 * Nebraska Highway 9, a state highway in the U.S. state of Nebraska

Other

 * Fairey N.9, a British seaplane
 * Jero N° 9 Antwerpen 1911, a 1911 aeroplane
 * London Buses route N9
 * N9, a postcode district in the N postcode area
 * N9, the Nokia N9 model N9-00, a MeeGo Linux phone
 * Negeri Sembilan, one of the 13 states in Malaysia
 * Netscape Navigator 9, a web browser created by Netscape Communications
 * Nonoxynol-9, a molecule
 * North Coast Aviation IATA airline designator
 * Northrop N-9, company designation of the Northrop YB-35 flying wing bomber
 * Northrop N-9M, research aircraft, built as a flying mockup of the Northrop YB-35
 * LNER Class N9, a class of British steam locomotives