Doorn is a town in the municipality of Utrechtse Heuvelrug in the central Netherlands, in the province of Utrecht.

Vikings quartered at Dorestad (now Wijk bij Duurstede) called the place Thorhem because, reputedly, the god of thunder was worshipped there.

Indeed, archeological diggings in a moor on the estate of Hoog Moersbergen, north of Doorn, prove that there was a pagan sacrificial site.

The Dutch novelist Simon Vestdijk lived in Doorn for a great part of his life (between 1939 and 1971, a few short intervals excepted).

At present, the castle is called Maarten Maartenshuis and is a part of the hotel and conference centre Zonheuvel.