Onhaye (French pronunciation: [ɔ̃ɛ]) is a municipality of Wallonia located in the province of Namur, Belgium.

The total area is 65.53 km2 (25.30 sq mi) which gives a population density of 48 inhabitants per square kilometre (120/sq mi).

The municipality consists of the following districts: Anthée, Falaën, Gerin, Onhaye, Serville, Sommière, and Weillen.

The region is home to several cultural heritage monuments, such as Château de Fontaine and the fortified farmhouse Falaën Castle.

This Namur Province location article is a stub.