N78

N78 may refer to:

Roads

 * N78 road (Ireland)
 * Ozamiz–Pagadian Road, in the Philippines
 * Nebraska Highway 78, in the United States

Other uses

 * N78 (Long Island bus)
 * HMS Talisman (N78), a submarine of the Royal Navy
 * Mangarrayi language
 * Nokia N78, a smartphone