Haarzuilens is a village in the Dutch province of Utrecht. It is a part of the municipality of Utrecht, and lies about 12 km west from the city centre of Utrecht. It was a separate municipality until 1954, when it was joined to the municipality of Vleuten. In 2018, the village of Haarzuilens has about 500 inhabitants. It is famous for De Haar Castle, which is surrounded by gardens and which is the location of the annual Elf Fantasy Fair. The castle, after 1892 fully refurbished by the Baroness Hélène van Zuylen and owned by baron since 2000, attracted 76,500 visitors in 2002.