International Union for Conservation of Nature

IUCN was founded in 1948, brings together States, government agencies and a diverse range of non-governmental organizations in a unique world partnership: over 980 members in all, spread across some 140 countries. IUCN's mission is to influence, encourage and assist societies throughout the world to conserve the integrity and diversity of nature and to ensure that any use of natural resources is equitable and ecologically sustainable.

Forests are an important ecosystem treated within the mission of the IUCN and it has identified itself as a collaborating agency on issues such as forest conservation and rehabilitation.

http://www.iucn.org