Bloody Night (Portuguese: Noite Sangrenta) is the name by which the radical revolt that took place in Lisbon, on the night of 19 October 1921, became known. During the day, a coup led Antnio Granjo's government to resign, but President Antnio Jos de Almeida resisted appointing the rebels' government. During the night, a riot led by a "ghost truck" led by Abel Olmpio resulted in five people associated with the Sidonist regime being killed and one being gravely injured.

António Joaquim Granjo (27 December 1881 – 19 October 1921; Portuguese pronunciation: [ɐ̃ˈtɔniu ˈɡɾɐ̃ʒu]) was a Portuguese lawyer and politician.

Granjo was born in Chaves.Already a committed republican from his youth, well before the 1910 overthrow of the monarchy, he became a member of the National Constituent Assembly, elected on 28 May 1911. He gave up his constituency in order to join the army; during Portuguese participation in World War I, he saw combat himself, and upon returning home he wrote a book about his battle experiences.

After President Sidónio Pais was shot dead, Granjo took action against the Monarchy of the North, an attempt to restore a royalist regime in the north of Portugal, in 1919. He was President of the Municipal Chamber of Chaves, from February to July 1919. That same year he was elected to the Chamber of Deputies, by the Evolutionist Party, later being a founder of its successor movement, the Republican Liberal Party. Minister of Justice during Domingos Pereira's coalition government, he served two brief terms as Prime Minister, the first time, from 19 July to 20 November 1920, in a liberal government. Afterwards he was nominated Prime Minister again, to take the place of another liberal, Tomé de Barros Queirós, on 30 August 1921.

During the infamous "Bloody Night" in Lisbon, on 19 October 1921, Granjo was assassinated. The political affiliation of his murderers' instigators is still a matter of dispute. That same night, two other prominent republicans of moderately right-wing sympathies, António Machado Santos (widely known as the founder of the republic) and José Carlos da Maia, also lost their lives.