Heiloo (Dutch pronunciation: [ɦɛiˈloː] ⓘ) is a municipality and town in the Netherlands, located in the province of North Holland.

Heiloo (from the Dutch heilige loo, "sacred forest") was given its name because Saint Willibrord was said to have performed a miracle there around 690 and created a church on a small hill.

[8][9] The Marian sanctuary, situated outside the village in a so-called procession park, is one of the major pilgrimage destinations in the Netherlands, attracting pilgrims mainly from the diocese of Haarlem-Amsterdam.

Connections from Heiloo railway station include: Alkmaar, Hoorn, Uitgeest, Zaandam, Amsterdam, Utrecht, 's-Hertogenbosch, Eindhoven, The Hague, Weert, Roermond, Maastricht and Heerlen.

Until October 2013 there was a second stop on the railway line between Heiloo and Limmen, used once a month to bring pilgrims to the nearby chapel.