N55

N55 may refer to:

Bus routes

 * N55 (Long Island bus)
 * London Buses route N55

Roads

 * N55 road (Ireland)
 * Indus Highway, in Pakistan
 * Romulo Highway, in the Philippines

Other uses

 * BMW N55, an automobile engine
 * HMS Undaunted (N55), a submarine of the Royal Navy
 * Jaluit Airport, on Jaluit Atoll, Marshall Islands
 * Nikon N55, a camera