Friends of the Earth England, Wales and Northern Ireland is one of 75 national groups around the world which make up the Friends of the Earth network of environmental organisations. It is usually referred to as just 'Friends of the Earth' within its home countries.

Friends of the Earth International (FoEI) is an international network of grassroots environmental organizations in 73 countries. About half of the member groups call themselves "Friends of the Earth" in their own languages; the others use other names. The organization was founded in 1969 in San Francisco by David Brower, Donald Aitken and Gary Soucie after Brower's split with the Sierra Club because of the latter's positive approach to nuclear energy. The founding donation of $500,000 was provided by Robert Orville Anderson, the owner of Atlantic Richfield oil company. It became an international network of organizations in 1971 with a meeting of representatives from four countries: U.S., Sweden, the UK and France.