The North Russia intervention, also known as the Northern Russian expedition, the Archangel campaign, and the Murman deployment, was part of the Allied intervention in the Russian Civil War after the October Revolution. The intervention brought about the involvement of foreign troops in the Russian Civil War on the side of the White movement. The movement was ultimately defeated, while the British-led Allied forces withdrew from Northern Russia after fighting a number of defensive actions against the Bolsheviks, such as the Battle of Bolshie Ozerki. The campaign lasted from March 1918, during the final months of World War I, to October 1919.

The Bolsheviks, led by Vladimir Lenin, were a far-left faction of the Marxist Russian Social Democratic Labour Party (RSDLP) which split with the Mensheviks at the Second Party Congress in 1903. The Bolshevik party seized power in Russia in the October Revolution of 1917, and was later renamed the Communist Party of the Soviet Union. Their ideology and practices, based on Leninist and later Marxist–Leninist principles, are known as Bolshevism.