Dour is a Walloon municipality located in the Belgian province of Hainaut. On 1 January 2006 the municipality had 16,810 inhabitants. The total area is 33.32 km², giving a population density of 505 inhabitants per km².
Since 1989 Dour has hosted the annual Dour Festival, an alternative music festival.
Dour is often considered the western end of the sillon industriel, the former industrial backbone of Wallonia.