州或地区（土耳其语：Vilayet，土耳其语发音：[vilaːˈjet]，音译为“维拉亚特”或“维拉耶”），奥斯曼帝国后期的一级行政区划，也有译为省或行省，1867年1月27日，奥斯曼帝国颁布《维拉亚特法》后正式将全国原来的各个省份（Eyalet）重新划分为州。在全国范围内颁布的《维拉亚特法》是“坦志麦特”系列改革的一部分，被载入了1856年的皇家法令。省区改革首先在多瑙州实施，多瑙州为改革派的重要人物米德哈特帕夏专门在1864年成立的。改革是逐步推进的，直到1884年，才扩展到帝国的全部省份。

The Vilayets (Turkish pronunciation: [vilaːˈjet]) of the Ottoman Empire were the first-order administrative division, or provinces, of the later empire, introduced with the promulgation of the Vilayet Law (Turkish:Teşkil-i Vilayet Nizamnamesi) of 21 January 1867. The reform was part of the ongoing administrative reforms that were being enacted throughout the empire, and enshrined in the Imperial Edict of 1856. The reform was at first implemented experimentally in the Danube Vilayet, specially formed in 1864 and headed by the leading reformist Midhat Pasha. The reform was gradually implemented, and not until 1884 was it applied to the entirety of the Empire's provinces.