After the formation of Second Polish Republic in the aftermath of World War I in 1918, Łachwa became part of the Polesie Voivodeship in the Kresy region. According to the Polish census of 1921, Łachwa population was 33 per cent Jewish. Eliezer Lichtenstein was the last Rabi before the Soviet invasion of Poland in 1939. After the Soviet-German invasion of Poland, Łachwa was annexed by the Soviet Union and became part of Belorussian SSR.