World Wildlife Fund

The World Wide Fund for Nature (WWF) (also known as World Wildlife Fund) is a Swiss-based international non-governmental organization founded in 1961 that works in the field of wilderness preservation and the reduction of human impact on the environment. The official name of the Swiss umbrella organization and in some countries is World Wild Fund for Nature following a renaming, while World Wildlife Fund remains the official name in other countries including Canada and the United States. WWF is the world's largest conservation organization, with over 5 million supporters worldwide, working in more than 100 countries and supporting around 3,000 conservation and environmental projects. It has invested over $1 billion in more than 12,000 conservation initiatives since 1995. WWF is a foundation with 65% of funding from individuals and bequests including The 1001: A Nature Trust, 17% from government sources (such as the World Bank, Foreign Office, and USAID) and 8% from corporations in 2020.

WWF aims to "stop the degradation of the planet's natural environment and to build a future in which humans live in harmony with nature." Living Planet Report has been published every two years by WWF since 1998; it is based on a Living Planet Index and ecological footprint calculation. In addition, WWF has launched several notable worldwide campaigns, including Earth Hour and the debt-for-nature swap, and its current work is organized around these six areas: food, climate, freshwater, wildlife, forests, and oceans.

WWF has faced criticism for its corporate ties and for support of conservation measures that have resulted in violent conflict with local people. WWF is part of the Steering Group of the Foundations Platform F20, an international network of foundations and philanthropic organizations.