The Peace Pledge Union (PPU) is a non-governmental organisation that promotes pacifism, based in the United Kingdom. Its members are signatories to the following pledge: "War is a crime against humanity. I renounce war, and am therefore determined not to support any kind of war. I am also determined to work for the removal of all causes of war", and campaign to promote peaceful and nonviolent solutions to conflict. The PPU forms the British section of War Resisters' International.
The PPU emerged from an initiative by Hugh Richard Lawrie 'Dick' Sheppard, canon of St Paul's Cathedral, in 1934, after he had published a letter in the Manchester Guardian and other newspapers, inviting men (but not women) to send him postcards pledging never to support war. 135,000 men responded and, with co-ordination by Sheppard, the Methodist Reverend John C. B. Myer, and others, formally became members. The initial male-only aspect of the pledge was aimed at countering the idea that only women were involved in the peace movement. In 1936 membership was opened to women, and the newly founded Peace News was adopted as the PPU's weekly newspaper. The PPU assembled several noted public figures as sponsors, including Aldous Huxley, Bertrand Russell, Storm Jameson, Rose Macaulay, Donald Soper, Siegfried Sassoon, Reginald Sorensen, J. D. Beresford, Ursula Roberts (who wrote under the pseudonym "Susan Miles") and Brigadier-General F. P. Crozier (a former army officer turned pacifist).
The PPU attracted members across the political spectrum, including Christian pacifists, socialists, anarchists and in the words of member Derek Savage, "an amorphous mass of ordinary well-meaning but fluffy peace-lovers". In 1937 the No More War Movement formally merged with the PPU. George Lansbury, previously chair of the No More War Movement, became president of the PPU, holding the post until his death in 1940. In 1937 a group of clergy and laity led by Sheppard formed the Anglican Pacifist Fellowship as an Anglican complement to the non-sectarian PPU.