| Arrondissement of Nivelles | |
| Native Name: | French: Arrondissement de Nivelles |
| Type: | Arrondissement of Belgium |
| Coordinates: | 50.67°N 4.58°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Belgium |
| Subdivision Type1: | Region |
| Subdivision Type2: | Province |
| Parts Type: | Municipalities |
| Parts Style: | para |
| P1: | 27 |
| Unit Pref: | Metric |
| Area Total Km2: | 1090.56 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
The Arrondissement of Nivelles (French: Arrondissement de Nivelles; Dutch; Flemish: Arrondissement Nijvel) is an arrondissement in Wallonia and Belgium. It is the only arrondissement in the province of Walloon Brabant, and is coterminous with it. Before 1995, it was one of three arrondissements in the Province of Brabant.
It is both an administrative and a judicial arrondissement, both having the same borders as the province.
The Administrative Arrondissement of Nivelles consists of the following 27 municipalities:[1]