
The Arrondissement of Nivelles is an arrondissement in 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.

Beauvechain is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 the municipality had 6,529 inhabitants. The total area is 38.58 km2, giving a population density of 169 inhabitants per km2.
Bousval is a town in the Belgian municipality of Genappe, located in the province of Walloon Brabant. Bousval is on the bank of the River Dyle.

Braine-le-Château is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2006, Braine-le-Château had a total population of 9,446. The total area is 22.70 km² which gives a population density of 416 inhabitants per km².

Chastre [ʃastʁ] is a French-speaking municipality in Belgium that is located in the Walloon region, in the province of Walloon Brabant.

Chaumont-Gistoux is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 Chaumont-Gistoux had a total population of 10,926. The total area is 48.09 km2 which gives a population density of 227 inhabitants per km2.

Clabecq is a section of the Walloon municipality of Tubize, located in the Belgian province of Walloon Brabant.
Court-Saint-Étienne is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 Court-Saint-Étienne had a total population of 9,408. The total area is 26.64 km² which gives a population density of 353 inhabitants per km².

Couture-Saint-Germain is a village and section of the municipality of Lasne, Walloon Brabant, Belgium.

Genappe is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 Genappe had a total population of 14,136. The total area is 89.57 km² which gives a population density of 158 inhabitants per km².

Grez-Doiceau is a Belgian municipality located in the province of Walloon Brabant. On January 1, 2006, Grez-Doiceau had a total population of 12,403. The total area is 55.44 km² which gives a population density of 224 inhabitants per km². Grez-Doiceau is watered by the Train, a tributary of the Dyle.

Hélécine is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 Hélécine had a total population of 3,068. The total area is 16.62 km² which gives a population density of 185 inhabitants per km².

Incourt is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2006, Incourt had a total population of 4,585. The total area is 38.79 km² which gives a population density of 118 inhabitants per km².

Jodoigne is a Walloon city and municipality located in the Belgian province of Walloon Brabant. On January 1, 2006, Jodoigne had a total population of 12,440. The total area is 73.31 km² which gives a population density of 170 inhabitants per km².

Limal is a suburb of the Belgian town of Wavre in the Walloon Region in the province of Walloon Brabant.

Maransart is a town and district of the Walloon municipality Lasne in the Belgian province of Walloon Brabant.
Marbais is part of the Belgian municipality of Villers-la-Ville, situated in Wallonia in the province of Walloon Brabant.

Mélin is a village in Wallonia, Belgium. It is part of the municipality of Jodoigne.

Mellery is a town in the Belgian municipality of Villers-la-Ville.

Mont-Saint-Guibert is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2012, Mont-Saint-Guibert had a total population of 7000. The total area is 18.63 km2 (7.19 sq mi) which gives a population density of 344 inhabitants per square kilometre (890/sq mi).
Ohain is a town in the municipality of Lasne in the province of Walloon Brabant, Belgium.

Orp-Jauche is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2008, Orp-Jauche had a total population of 8,400. The total area is 50.50 km² which gives a population density of 159 inhabitants per km².

Perwez is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 the municipality had 7,487 inhabitants. The total area is 50.81 km², giving a population density of 147 inhabitants per km².
Plancenoit is a Walloon village and section of the municipality of Lasne, Walloon Brabant, Belgium. The village was a key strategic point during the Battle of Waterloo as it was the main focal point of the Prussians' successful flank attack on Napoleon's army.
Quatre Bras is a hamlet in the municipality of Genappe, Wallonia, Belgium. It lies on the crossroad of the Charleroi-Brussels road and the Nivelles-Namur road south of Genappe.

Ramillies is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2012, Ramillies had a total population of 6,211. The total area is 48.68 km² which gives a population density of 128 inhabitants per km².

Rebecq is a Walloon municipality located in the Belgian province of Walloon Brabant. On 1 January 2006 the municipality had 10,241 inhabitants. The total area is 39.08 km², giving a population density of 262 inhabitants per km².
Rixensart is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2006, Rixensart had a total population of 21,355. The total area is 17.54 km² which gives a population density of 1,217 inhabitants per km².

Sart-Dames-Avelines is a Belgian village in the municipality of Villers-la-Ville, in the south of the province of Walloon Brabant.
Tubize is a Walloon city and municipality located in the Belgian province of Walloon Brabant. On January 1, 2006 Tubize had a total population of 22,335. The total area is 32.66 km2 which gives a population density of 684 inhabitants per km2.
Villers-la-Ville is a Walloon municipality located in the Belgian province of Walloon Brabant. On January 1, 2006, Villers-la-Ville had a total population of 9,572. The total area is 47.45 km² which gives a population density of 202 inhabitants per km². The municipality includes also the villages of Marbais, Mellery, Sart-Dames-Avelines and Tilly.
Walhain is a Walloon municipality of Belgium located in the province of Walloon Brabant. It consists of the former municipalities of Nil-Saint-Vincent-Saint-Martin, Tourinnes-Saint-Lambert and Walhain-Saint-Paul.