Sombreffe (; ) is a municipality of Wallonia located in the province of Namur, Belgium.
On 1 January 2014 the municipality had 8,226 inhabitants. The total area is 35.78 km<sup>2</sup>, giving a population density of 230 inhabitants per km<sup>2</sup>.
The municipality is composed of the following districts: Boignée, Ligny, Sombreffe and Tongrinne.