The Latvian Socialist Soviet Republic was a short-lived socialist republic formed during the Latvian War of Independence. It was proclaimed on 17 December 1918 with the political, economic, and military backing of Vladimir Lenin and his Bolshevik government in the Russian SFSR. The head of government was Pēteris Stučka with Jūlijs Daniševskis as his deputy.

The Latvian War of Independence, sometimes called Latvia's freedom battles or the Latvian War of Liberation, was a series of military conflicts in Latvia between 5 December 1918, after the newly proclaimed Republic of Latvia was invaded by Soviet Russia, and the signing of the Latvian-Soviet Riga Peace Treaty on 11 August 1920.