Qasr Libya or Qasr Lebia (Arabic: قصر ليبيا, lit.

'Lebia Castle', Lebia/Libya being a corruption of the ancient name Olbia) is a small town in northern Libya about 66 kilometres (41 mi) northwest of Bayda.

In ancient times, it was a Roman / Byzantine town called Olbia and Theodorias, the ruins of which were excavated in the 1950s.

The town contains a museum with fifty Byzantine mosaics.

This Libya location article is a stub.