| Wellin | |
| Map: | Wellin Luxembourg Belgium Map.svg |
| Map-Legend: | Location of Wellin in Luxembourg province |
| Arms: | Blason commune de Wellin (Belgique).svg |
| Arrondissement: | Neufchâteau |
| Nis: | 84075 |
| Mayor: | Benoît Closson |
| Majority: | Wellin dem@in |
| Postal-Codes: | 6920-6922, 6924 |
| Telephone-Area: | 084 |
| Web: | wellin.be |
| Coordinates: | 50.0817°N 11.8°W |
Wellin (in French pronounced as /wɛlɛ̃/; Walloon: Welin) is a municipality of Wallonia located in the province of Luxembourg, Belgium.
On 1 January 2007 the municipality, which covers 67.52 km2, had 2,958 inhabitants, giving a population density of 43.8 inhabitants per km2.
The municipality consists of the following districts: Chanly, Halma, Lomprez, Sohier, and Wellin. Other population centers include: Barzin, Froidlieu, Fays-Famenne, and Neupont.