The Socialist Soviet Republic of Lithuania and Belorussia (SSR LiB), alternatively referred to as the Socialist Soviet Republic of Lithuania and White Russia or simply Litbel (Lit-Bel), was a Soviet republic that existed within the parts of the territories of modern Belarus and Lithuania for approximately five months during the Lithuanian–Soviet War and the Polish–Soviet War in 1919.

The Republic of Central Lithuania, commonly known as the Central Lithuania, and the Middle Lithuania, was an unrecognized short-lived puppet state of Poland, that existed from 1920 to 1922.