The Vilayet of Manastir (Ottoman Turkish: ولايت مناستر, Vilâyet-i Manastır) was an Ottoman vilayet, 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.
Initially the Manastir Vilayet had the following sanjaks:
After administrative reforms in 1867 and 1877 some parts of the Manastir Vilayet were ceded to newly established Scutari Vilayet (1867) and Kosovo Vilayet (1877).
Administrative divisions of Manastir Vilayet until 1912:
- Sanjak of Manastir: Kazas of Manastir (Bitola), Pirlepe (Prilep), Florina, Kıraçova (Kičevo) and Ohrid.
- Sanjak of Serfiğe (Between 1864-1867 and 1873–1892): Kazas of Serfiçe (modern Servia), Kozana (modern Kozani), Alasonya (modern Elasson), Cuma, Nasliç (modern Neapolis, Kozani) and Grebne (modern Grevena).
- Sanjak of Dibra: Kazas of Debre-i Bala, Mat, Debre-i Zir (Its center was Piskopoya), Rakalar (region around river Radika (its local name is River region (Macedonian: Река).
- Sanjak of Elbasan (İlbasan): Kazas of İlbasan, Grameç and Peklin.
- Sanjak of Görice: Kazas of Görice (Korçë), İstarova (Pogradec), Kolonya (Erseke) (Its center was Ersek) and Kesriye (Kastoria).
A publication from December 21, 1912 in the Belgian magazine Ons Volk Ontwaakt (Our Nation Awakes) estimated 747,000 inhabitants:
The Greeks were part of the Ecumenical Patriarchate of Constantinople, while the Bulgarians were part of the Bulgarian Exarchate.