The Women's International League for Peace and Freedom (WILPF) is the oldest women's peace organisation in the world. It was founded in April 1915, in the Hague, the Netherlands, by 1300 women from Europe and North America, who came together in a Congress of Women to protest the killing and destruction of the war then raging in Europe.

WILPF is an international Non-Governmental Organization (NGO) with National Sections in 37 countries, covering all continents. It's International Secretariat is based in Geneva with a New York UN office.

WILPF has consultative status with the United Nations Economic and Social Council (ECOSOC), United Nations Educational, Scientific and Cultural Organization (UNESCO) and the UN Conference on Trade and Development (UNCTAD).

The UK Section of WILPF is active in campaigns around human rights, women peace and security, disarmament, the environment, global economic justice and sustainable development.