Far-left politics in the United Kingdom

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Far-left politics in the United Kingdom have existed since at least the 1840s, with the formation of various organisations following ideologies such as Marxism, revolutionary socialism, communism, anarchism and syndicalism.

Following the 1917 Russian Revolution and developments in international Marxism, new organisations advocated ideologies such as Marxism–Leninism, Left Communism and Trotskyism.

Following the Chinese Communist Revolution, further international developments from the 1960s led to the emergence of Maoist and later Hoxhaist groups. Political schisms within these tendencies created a large number of new political organisations, particularly from the 1960s to the 1990s.