MONTIS – Associação para a Gestão e Conservação da Natureza (nature conservation association) is an environmental non-governmental organisation (ENGO), which is non -profit and works on the Portuguese territory. MONTIS was founded on the 21th of March 2014 and is based in Vouzela, district of Viseu. In March 2025, MONTIS has 361 associates and manages around 300 ha – which comprise 34 properties in the centre of Portugal and one near Lisbon.

The main objectives of MONTIS are to ensure the development of natural processes, to promote conservation of native species, to manage in a considered manner forest fires and other natural damages and to increase the value of biodiversity.