Radziejowice () is a village in à »yrardów County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Radziejowice.
Radziejowice was the seat of the Radziejowski noble family, which gained considerable influence in Poland in the 17th century. Stanisà Âaw Radziejowski often hosted Polish King Sigismund III Vasa in Radziejowice, his son Hieronim Radziejowski hosted King Wà Âadysà Âaw IV Vasa in 1642, and his grandson Michaà  Stefan Radziejowski hosted Countess Palatine Hedwig Elisabeth of Neuburg, wife of Polish Prince James Louis Sobieski. After the death of Michaà  Stefan Radziejowski, it subsequently passed to the Praà ¼mowski, Ossolià Âski and Krasià Âski families. The Krasià Âski family founded a Catholic parish in 1786 and built a new Neoclassical church in 1822. In 1827, the village had a population of 249.
In 1870, a brickyard was established in Radziejowice.
Following the German-Soviet invasion of Poland, which started World War II in September 1939, the village was occupied by Germany until 1945.
The landmark of Radziejowice is the Radziejowice Castle, Palace and Park Complex, which additionally contains a lake, wooden manor house and busts of several famous Poles, including Fryderyk Chopin, Ignacy Jan Paderewski, Henryk Sienkiewicz, Juliusz Sà Âowacki, Stanisà Âaw Wyspiaà Âski and Józef Cheà Âmoà Âski. Other sights include the Neoclassical Saint Casimir church.