Lüleburgaz (Turkish: [lyˈlebuɾɡaz], Modern Greek: Λουλέ Μπουργκάς Lule Burgas, Bulgarian: Люлебургаз Lyuleburgaz), Bergoulion (Ancient Greek: Βεργούλιον) or Arcadiopolis (Ancient Greek: Αρκαδιόυπολις Arkadiópolis) is the largest city and district of Kırklareli Province in the Marmara region of Turkey. Located at the border with Bulgaria within the historic region of East Thrace in Rumelia, the city is typically home to Balkan Turks mainly from Albania, Bulgaria, Greece, Romania and ex-Yugoslavia, that have immigrated to Turkey from the nineteenth century on.
Economically, Lüleburgaz is an important centre of manufacturing for pharmaceutical and electronic industries, as well as agriculture.