The article is devoted to the research on the policy of the Polish government with a Lithuanian minority between 1920 and 1939. Polish authorities paid much less attention to the problem of the Lithuanian minority in comparison with those of Ukrainians or Germans at that time. Similarly, in the north-eastern territories of the Second Polish Republic, it was a Byelorussian minority, not Lithuanians that posed troubles to the government. Throughout the interwar period the authorities hoped for diplomatic relations with Lithuania. Therefore, the problem of the minority was treated as a foreign affair not as an interior problem.