Anti-Slavery International, founded as the British and Foreign Anti-Slavery Society in 1839, is an international non-governmental organization, registered charity, and advocacy group, based in the United Kingdom. It is the world’s oldest international human rights organization and works exclusively against slavery and related abuses.

It owes its origins to the radical element of an older organization also commonly referred to as the “Anti-Slavery Society”, the Society for the Mitigation and Gradual Abolition of Slavery Throughout the British Dominions, which had substantially achieved the abolition of slavery in the British Empire by August 1838. The new British and Foreign Anti-Slavery Society was created to campaign against the practice of slavery in other countries.

Anti-Slavery International has consultative status with the United Nations Economic and Social Council and observer status at the International Labour Organization. It is a non-religious, non-political independent organization. It works closely with partner organizations from around the world to tackle all forms of slavery.

Anti-Slavery International instituted the Anti-Slavery Award in 1991 to draw attention to the continuing problem of slavery in the world today and to provide recognition for long-term, courageous campaigning by organizations or individuals in the countries most affected.

According to Wikipedia