The article concerns international recognition of the Polish state established after World War I in the year 1918, the Polish state and the status of Poland in terms of international law during World War II and after its conclusion until the birth of the Third Polish Republic in the year 1989. A study of related issues confirmed the thesis of the identity and continuity of the Polish state by international law since the year 1918, as solidified in Polish international law teachings, and showed that the Third Polish Republic is, under international law, not a new state, but a continuation of both the Second Polish Republic as well as the People’s Republic of Poland.