Lébény (Latin: Quadrata or Stailuco) is a town in Győr-Moson-Sopron County, midway between Mosonmagyaróvár and Győr, Hungary.

Similar family or clan-financed medieval Hungarian monastic churches can be found in Ják, Ócsa, Nyírbátor, Harina and Mălâncrav.

Signs of human occupation have been found from the Neolithic, through the Bronze and Iron Ages, including excavated remains of Celtic habitation.

When Tiberius, later the Roman Emperor, overran Transdanubia in AD 9, he established a military camp and civilian settlement in the area of present-day Lébény.

Excavations have confirmed there was already a sizeable community at Lébény at the time of the Hungarian Conquest of the Carpathian Basin in the 9th and 10th centuries, including Slavic groups.