Het Loo Palace is a palace in Apeldoorn, Netherlands. The symmetrical Dutch Baroque building was designed by Jacob Roman and Johan van Swieten and was built between 1684 and 1686 for stadtholder-king William III and Mary II of England. The garden was designed by Claude Desgotz.
The palace was a residence of the House of Orange-Nassau from the 17th century until the death of Queen Wilhelmina in 1962. The building was renovated between 1976 and 1982. Since 1984, the palace is a state museum open for the general public, showing interiors with original furniture, objects and paintings of the House of Orange-Nassau.
The building is a rijksmonument and is among the Top 100 Dutch heritage sites.
In 2013, the museum had 410,000 visitors, which makes it the 8th most visited museum in the Netherlands.