After World War I in the Upper Silesia plebiscite 4,546 out of 6,461 voters in Bielszowice voted in favour of rejoining Poland which just regained independence, against 1,874 opting for staying in Germany. Afterwards it became a part of Silesian Voivodeship, Second Polish Republic. During the German invasion of Poland, which started World War II, the village was invaded and then occupied by Nazi Germany, and already on September 3, 1939 the Germans carried out the first execution of a local Polish man (see "Nazi crimes against the Polish nation"). , notable local member of the Polish resistance movement, who as its secret agent joined and infiltrated the German "SA", was publicly hanged by the Germans in Bielszowice in 1942. There is monument at the execution site. After the war, the settlement was restored to Poland.