The 1st Lithuanian–Belarusian Division (Polish: 1. Dywizja Litewsko-Białoruska, 1.DL-B; Belarusian: 1-ая Літоўска-Беларуская дывізія; Lithuanian: 1-oji Lietuvos-Baltarusijos divizija) was a volunteer unit of the Polish Army formed around December 1918 and January 1919 during the Polish–Soviet War. It was created out of several dozen smaller units of self-defence forces composed of local volunteers in what is now Lithuania and Belarus, amidst a growing series of territorial disputes between the Second Polish Republic, the Russian SFSR, and several other local provisional governments. The Division took part in several key battles of the war. Around 15-18% of the division were ethnic Lithuanians.