The Socialist Workers and Peasants Party of Latvia (Latvian: Latvijas Sociālistiskā Strādnieku un Zemnieku Partija) was a political party in Latvia. The party was an illegal underground party, formed in 1934 by the left-wing sector of the Latvian Social Democratic Workers Party after the ban on parties following the coup of Kārlis Ulmanis. The party was led by , who had been the chairman of the pre-split Latvian Social Democratic Workers Party. The party was disbanded in July 1940 after the Soviet occupation of the Baltic states.