Amnesty International (also referred to as Amnesty or AI) is an international non-governmental organization focused on human rights, with its headquarters in the United Kingdom. The organization says that it has more than ten million members and supporters around the world. The stated mission of the organization is to campaign for "a world in which every person enjoys all of the human rights enshrined in the Universal Declaration of Human Rights and other international human rights instruments". The organization has played a notable role on human rights issues due to its frequent citation in media and by world leaders.

AI was founded in London in 1961 by the lawyer Peter Benenson. In what he called "The Forgotten Prisoners" and "An Appeal for Amnesty", which appeared on the front page of the British newspaper The Observer, Benenson wrote about two students who toasted to freedom in Portugal and four other people who had been jailed in other nations because of their beliefs. AI's original focus was prisoners of conscience, with its remit widening in the 1970s, under the leadership of Seán MacBride and Martin Ennals, to include miscarriages of justice and torture. In 1977, it was awarded the Nobel Peace Prize. In the 1980s, its secretary general was Thomas Hammarberg, succeeded in the 1990s by Pierre Sané. In the 2000s, it was led by Irene Khan.

Amnesty International is an international human rights organisation that campaigns worldwide to protect individuals' and groups' rights. It conducts research and runs information and education efforts to highlight violations.

Amnesty International was founded in London in July 1961 by English barrister Peter Benenson, who had previously been a founding member of the UK law reform organization JUSTICE. Benenson was influenced by his friend Louis Blom-Cooper, who led a political prisoners' campaign. According to Benenson's own account, he was travelling on the London Underground on 19 November 1960 when he read that two Portuguese students from Coimbra had been sentenced to seven years of imprisonment in Portugal for allegedly "having drunk a toast to liberty". Researchers have never traced the alleged newspaper article in question. In 1960, Portugal was ruled by the Estado Novo government of António de Oliveira Salazar. The government was authoritarian in nature and strongly anti-communist, suppressing enemies of the state as anti-Portuguese. In his significant newspaper article "The Forgotten Prisoners", Benenson later described his reaction as follows:

Open your newspaper any day of the week and you will find a story from somewhere of someone being imprisoned, tortured or executed because his opinions or religion are unacceptable to his government... The newspaper reader feels a sickening sense of impotence. Yet if these feelings of disgust could be united into common action, something effective could be done.

Benenson worked with his friend Eric Baker – a member of the Religious Society of Friends who had been involved in funding the British Campaign for Nuclear Disarmament as well as becoming head of Quaker Peace and Social Witness. In his memoirs, Benenson described him as "a partner in the launching of the project". In consultation with other writers, academics and lawyers and, in particular, Alec Digges, they wrote via Louis Blom-Cooper to David Astor, editor of The Observer newspaper, who, on 28 May 1961, published Benenson's article "The Forgotten Prisoners". The article brought the reader's attention to those "imprisoned, tortured or executed because his opinions or religion are unacceptable to his government" or, put another way, to violations, by governments, of articles 18 and 19 of the Universal Declaration of Human Rights (UDHR). The article described these violations occurring, on a global scale, in the context of restrictions to press freedom, to political oppositions, to timely public trial before impartial courts, and to asylum. It marked the launch of "Appeal for Amnesty, 1961", the aim of which was to mobilize public opinion, quickly and widely, in defence of these individuals, whom Benenson named "Prisoners of Conscience".

The "Appeal for Amnesty" was reprinted by a large number of international newspapers. In the same year, Benenson had a book published, Persecution 1961, which detailed the cases of nine prisoners of conscience investigated and compiled by Benenson and Baker (Maurice Audin, Ashton Jones, Agostinho Neto, Patrick Duncan, Olga Ivinskaya, Luis Taruc, Constantin Noica, Antonio Amat and Hu Feng).

In July 1961, the leadership had decided that the appeal would form the basis of a permanent organization, Amnesty, with the first meeting taking place in London. Benenson ensured that all three major political parties were represented, enlisting members of parliament from the Labour Party, the Conservative Party, and the Liberal Party. On 30 September 1962, it was officially named "Amnesty International". Between the "Appeal for Amnesty, 1961" and September 1962 the organization had been known simply as "Amnesty".