Villasor, Biddesorris or Bidda de Sorris in Sardinian language, is a comune (municipality) in the Province of Cagliari in the Italian region Sardinia, located about 25 kilometres (16 mi) northwest of Cagliari. As of 31 December 2004, it had a population of 7,022 and an area of 86.6 square kilometres (33.4 sq mi).
Villasor borders the following municipalities: Decimomannu, Decimoputzu, Monastir, Nuraminis, San Sperate, Serramanna, Vallermosa, Villacidro.