The Vilayet of Manastir (Ottoman Turkish: ولايت مناستر, Vilâyet-i Manastır‎) was a first-level administrative division (vilayet) of the Ottoman Empire, created in 1874, dissolved in 1877 and re-established in 1879. The vilayet was occupied during the First Balkan War in 1912 and divided between the Kingdom of Greece and the Kingdom of Serbia, with some parts later becoming part of the newly established Principality of Albania.