The 1st Lithuanian–Belarusian Division (, ) 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 created out of local volunteers in what is now Lithuania and Belarus amidst a growing series of territory disputes between the Second Polish Republic, the Russian SFSR and several others local provisional governments and took part in several key battles of the war.