Parc de Montesquiu, Protected natural area in Montesquiu, Spain.

The Parc de Montesquiu is a protected natural area northwest of Barcelona with forested land of oak and red pine trees surrounding the Ter River. The grounds feature a network of walking paths that lead through different woodland types and open spaces.

A medieval castle on the grounds dates back to the 10th century and served as a defensive structure protecting the region. The building played an important role in local protection against threats during the medieval period.

The castle is now a resource centre and venue for conventions, seminars and educational activities run by the Diputació de Barcelona. The park also keeps a link with Montesquieu in Gers, France: a twinning protocol was signed in Montesquiu on 5 November 1998, and on 30 April 2000 the two towns committed to lasting ties and solidarity.

Visiting is possible throughout the year and various walking routes are accessible for different fitness levels. Information materials in multiple languages help visitors plan their route and understand the plants and wildlife.

The park's most notable monument is the castle, documented since the 13th century and built around a small rectangular watchtower probably erected between the 10th and 11th centuries. In 1976 its last owner, Emili Juncadella, gave the castle and estate to the Diputació de Barcelona, which adapted rooms for educational activities and seminars.