Sclessin (French pronunciation: [sklesɛ̃]) is a quarter of the city of Liège located in the province of Liège, Wallonia, Belgium. Before the fusion of the Belgian municipalities in 1977, it was a quarter of the municipality of Ougrée. On 1 January 1977, it was merged into Liège. Sclessin has never been a municipality, but in some sources, Sclessin is mentioned as a "section" (sub-municipality).