Manhay (; ) is a municipality of Wallonia located in the province of Luxembourg, Belgium.
On 1 January 2007 the municipality, which covers 119.81 km<sup>2</sup>, had 3,185 inhabitants, giving a population density of 26.6 inhabitants per km<sup>2</sup>.
The municipality consists of the following districts: Dochamps, Grandménil, Harre, Malempré, Odeigne and Vaux-Chavanne (town centre).