Vereniging tot Behoud van Natuurmonumenten in Nederland (English: Society for Preservation of Nature Monuments in the Netherlands), also known as Vereniging Natuurmonumenten, is a Dutch nature conservation organization founded in 1905 by Jacobus Pieter Thijsse and Eli Heimans, that buys, protects, and manages nature reserves in the Netherlands.
The first area that the organization purchased in 1905 was to protect the Naardermeer, southeast of Amsterdam.
It had 355 sites under its management in 2010, with a total area of 1,029.51 km2 (397.50 sq mi).
The organization also owns 1,700 buildings, of which 250 were provincial or national monuments.
[1][incomplete short citation] The organisation moved their headquarters to Amersfoort at the end of 2020.