N40

N40 may refer to:

Roads

 * N40 road (Ireland)
 * N-40 National Highway in Pakistan
 * Nebraska Highway 40, in the United States

Other

 * N40 (Long Island bus)
 * Benign prostatic hyperplasia
 * BMW N40, an automobile engine
 * Naughty Forty, a football hooligan firm linked to Stoke City F.C.
 * Sky Manor Airport (New Jersey), in Hunterdon County, New Jersey, United States
 * Toyota Hilux (N40), a Japanese pickup truck
 * IBM RISC System/6000 N40, a laptop; see IBM RS/6000 § Type 7007