Olkusz County is a unit of territorial administration and local government (powiat) in Lesser Poland Voivodeship, southern Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Olkusz, which lies north-west of the regional capital Kraków. The county also contains the towns of Bukowno, lying west of Olkusz, and Wolbrom, north-east of Olkusz.