Achttienhoven is a former hamlet in the municipality of De Bilt, in the Netherlands. It is now considered to be part of the village of Westbroek. Achttienhoven used to be a heerlijkheid (manor), until it became part of Westbroek in 1812. From 1818 to 1954, Achttienhoven was a separate municipality again. It then merged with Westbroek, which in its turn was annexed by Maartensdijk in 1957. According to the 19th-century historian A.J. van der Aa, the village used to be called "Everckesdorp". The name "Achttienhoven" means "Eighteen Farms".