拉恩（法语：Lasne）是位于比利时瓦隆-布拉班特省部的一座城市，人口13,939人（2006年）。

Lasne (Walloon:Lane) is a Walloon municipality in the Belgian province of Walloon Brabant, south east of Brussels. In 2008, Lasne had a population of 14,043. The total area is 47.22 km² which gives a population density of 297 inhabitants per km². Lasne is the richest municipality in Wallonia, measured by the average taxable income of the inhabitants. It also has the lowest local taxes of any municipality in Belgium.