The N51 is a road in Luxembourg City, in southern Luxembourg. It is one of the city's main thoroughfares, carrying traffic from Ville Haute, through Kirchberg, to a junction with the A1. For the north-eastern three quarters of its length, on the eastern side of the Alzette, it bears the name Avenue John F. Kennedy. West of the Alzette, it is successively named Boulevard Robert Schuman ; Boulevard de la Foire; and Boulevard Grand-Duchesse Charlotte.