Koryo-saram or Koryoin are ethnic Koreans in the post-Soviet states who descend from Koreans who were living in the Russian Far East.

The deportation of Koreans in the Soviet Union was the forced transfer of nearly 172,000 Soviet Koreans (Koryo-saram) from the Russian Far East to unpopulated areas of the Kazakh SSR and the Uzbek SSR in 1937 by the NKVD on the orders of Soviet leader Joseph Stalin and Chairman of the Council of People's Commissars of the Soviet Union Vyacheslav Molotov. 124 trains were used to resettle them 6,400 km to Central Asia. The reason was to stem "the infiltration of Japanese espionage into the Far Eastern Krai", as Koreans were at the time subjects of the Empire of Japan, which was the Soviet Union's rival. However, some historians regard it as part of Stalin's policy of "frontier cleansing". Estimates based on population statistics suggest that between 16,500 and 50,000 deported Koreans died from starvation, exposure, and difficulties adapting to their new environment in exile.