Lierneux (French pronunciation: [ljɛʁnø]; Walloon: Lierneu) is a municipality of Wallonia located in the province of Liège, Belgium.

Lierneux is known for its psychiatric hospital CHS l'Accueil.

The municipality consists of the following districts: Arbrefontaine, and Bra, and Lierneux.

Within the bounds of the municipality a lies a memorial site to the tribute of the 82nd Airborne Division who won the Battle of the Bulge against the German SS division December 22, 1944.

This Liège Province location article is a stub.