N6
N6 may refer to

Roads
 N6 road (Belgium), a road connecting Brussels over Halle, Soignies and Mons
 N6 road (France)
 N6 road (Gabon)
 N6 road (Ireland)
 N6 road (Luxembourg)
 N6 road (Senegal)
 N6 road (South Africa), a national road connecting East London and Bloemfontein
 N6 road (Switzerland)

Other
 N6 (Long Island bus)
 N6, a postcode district in the N postcode area
 SP&S Class N-6, a steam locomotives class
 USS N-6 (SS-58), a 1917 N-class coastal defense submarine of the United States Navy
 Neapolitan sixth, a chord in music
 N6, the chemical formula of hexazine