Jalhay (; ) is a municipality of Wallonia located in the province of Liège, Belgium.
On 1 January 2006 Jalhay had a total population of 7,953. The total area is 107.75 km<sup>2</sup> which gives a population density of 74 inhabitants per km<sup>2</sup>.
The municipality consists of the following districts: Jalhay and Sart.
The highest point of the municipality is the Baraque Michel in the High Fens, at .