Ostiano is a comune in the Province of Cremona in the Italian region Lombardy, located about 90 kilometres southeast of Milan and about 20 kilometres northeast of Cremona. As of 31 December 2004, it had a population of 3,054 and an area of 19.4 square kilometres. Ostiano borders the following municipalities: Gabbioneta-Binanuova, Gambara, Pessina Cremonese, Pralboino, Seniga, Volongo.