The Maas-Schwalm-Nette Nature Park (German: Naturpark Maas-Schwalm-Nette; Dutch: Grenspark Maas-Swalm-Nette) or NMSM is a cross-border nature park in Germany and the Netherlands, which was founded in 2002. It is a regionally important recreation area.
The park has an area of 870 km². Its name comes from the major rivers that flow through it, the Maas (English: Meuse), Schwalm and Nette.
The park is often confused with the Schwalm-Nette Nature Park which was founded in 1965 and has since been integrated into the NMSN.
It covers an area that includes the counties of Kleve, Viersen and Heinsberg as well as the town of Mönchengladbach in Germany and in the municipalities of Roermond, Roerdalen, Venlo, Echt-Susteren, Leudal and Maasgouw in the Netherlands.
Within the Maas-Schwalm-Nette Nature Park is the nature reserve of Krickenbecker Seen with its four lakes that were formed by peat cutting. On the territory of Niederkrüchten lies the only juniper heath of the Lower Rhine Region, surrounded by the Elmpter Schwalmbruch. In addition the Kaldenkirchen Border Forest (Nettetal) with its arboretum, the Sequoia Farm and the geo-hydrological water garden is part of the park.