Aywaille (; ) is a municipality of Wallonia located in the province of Liège, Belgium.
On 1 January 2012, Aywaille had a total population of 11,697. The total area is 80.04 km<sup>2</sup> which gives a population density of 146 inhabitants per km<sup>2</sup>. Its area consists of 45.7% of wooded and wild country, 29.9% of agricultural areas and 24.4% of built-up areas.
The inhabitants of Aywaille are called the "Aqualiens", from the Latin version of Aywaille "Aqualia loca", which means "area full of water" or "muddy land".