| Walcourt | |
| Picture-Legend: | Walcourt centre with the Basilica of Saint Maternus |
| Map: | Walcourt Namur Belgium Map.svg |
| Map-Legend: | Location of Walcourt in the province of Namur |
| Arms: | Walcourt wapen.svg |
| Flag: | Walcourt vlag.svg |
| Arrondissement: | Philippeville |
| Nis: | 93088 |
| Mayor: | Christine Poulin (PS) |
| Majority: | PS - MR |
| Postal-Codes: | 5650, 5651 |
| Telephone-Area: | 071 |
| Web: | www.walcourt.be |
| Coordinates: | 50.25°N 29°W |
Walcourt (pronounced as /fr/; wa|Walcoû) is a city and municipality of Wallonia located in the province of Namur, Belgium.
On 1 January 2006, the municipality had 17,516 inhabitants. The total area is 123.18 km2, giving a population density of 142 inhabitants per km2.
The municipality consists of the following districts: Berzée, Castillon, Chastrès, Clermont, Fontenelle, Fraire, Gourdinne, Laneffe, Pry, Rognée, Somzée, Tarcienne, Thy-le-Château, Vogenée, Walcourt, Yves-Gomezée.
The Basilica of Saint Maternus is a Gothic minor basilica, founded in 1026. It contains one of the oldest Madonnas in Western Christianity. In 1689, the Battle of Walcourt was fought here between French troops and the Grand Alliance during the Nine Years' War.