Chimay is a city and municipality of Wallonia located in the province of Hainaut, Belgium. In 2006, Chimay had a population of 9,774. The area is 197.10 km² which gives a population density of 50 inhabitants per km². It is the source of the Oise River.
In the administrative district of Thuin, the municipality was created with a merger of 14 communes in 1977. The Trappist monastery of Scourmont Abbey in the town is famous for the Chimay Brewery.