Molenbeek, Brook in Denderstreek region, Belgium.

The Molenbeek is a 22-kilometre brook in the Denderstreek that rises in Grotenberge and flows into the tidal Bovenschelde near Wichelen. Its basin covers about 5,276 hectares across Wichelen, Lede, Erpe-Mere, Herzele and a small part of Zottegem. Fourteen named tributaries feed it, including the Steenmeersbeek, Valleibeek and Wellebeek. In Erpe-Mere, three watermills stand on its course.

The Molenbeek powered three watermills in Erpe-Mere; one is protected by law, while another was largely demolished, though its mill house and remains survive. The brook was formerly called Bruynbeke, after the brown colour of its faster-flowing water, and the hamlet Bruinbeke in Schellebelle is named after it.

The brook's old name was Bruynbeke, after the brown colour of its water when it still flowed faster; the hamlet of Bruinbeke in Schellebelle is named after it. In Erpe-Mere three watermills stood on the stream, one of them protected by law, and the mill house of a largely demolished mill survives. The Molenbeekroute walking route follows the brook.

The Molenbeekroute walking route and a section of the Denderroute Zuid run along the brook, so the water can be followed on foot through Erpe-Mere, Lede, Herzele and Wichelen. The stream is shallow and stone-lined in places, with small pipes discharging into it; the banks are grassy and can be soft after rain.

The brook's old name, Bruynbeke, refers to the brown colour the water had when the stream still flowed faster; the hamlet of Bruinbeke in Schellebelle is named after it. The Molenbeek should not be confused with the 25 km Molenbeek-Ter Erpenbeek, which also runs through Erpe-Mere and Herzele.