The World Wide Fund for Nature (WWF) is an international non-governmental organization for the conservation, research and restoration of the natural environment, formerly named the World Wildlife Fund, which remains its official name in the United States and Canada. It is the world's largest independent conservation organization with over 5 million supporters worldwide, working in more than 90 countries, supporting 15,000 conservation and environmental projects around the world. It is a charity, with approximately 90% of its funding coming from voluntary donations by private individuals and businesses.

The group says its mission is "to halt and reverse the destruction of our natural environment". Currently, much of its work focuses on the conservation of three biomes that contain most of the world's biodiversity: forests, freshwater ecosystems, and oceans and coasts. Among other issues, it is also concerned with endangered species, pollution and climate change. The organization runs more than 1,200 field projects worldwide in any given year.