Hoeilaart is a municipality in the province of Flemish Brabant, in Flanders, one of the three regions of Belgium. The name Hoeilaart is of Gallic-Celtic origin, coming from "Ho-Lar," meaning a high clearing in the woods. Residents are called Hoeilanders or Doenders. The municipality only comprises the town of Hoeilaart proper. On January 1, 2006 Hoeilaart had a total population of 10,074. The total area is 20.43 km² which gives a population density of 493 inhabitants per km². Hoeilaart also sometimes called "The Glass Village" because of the greenhouse grape cultivation that once took place.
The official language is Dutch. Local minorities consist of nationals from many European union-countries, USA and Canada, and from French-speakers.