Olne (; ) is a municipality of Wallonia located in the province of Liège, Belgium.
On January 1, 2006, Olne had a total population of 3,793. The total area is 15.99 km<sup>2</sup> which gives a population density of 237 inhabitants per km<sup>2</sup>.
Olne was the 24th village to join Les Plus Beaux Villages de Wallonie.