A sanjak or sancak (Ottoman Turkish: سنجاق, sancak, "flag, banner") was an administrative division of the Ottoman Empire. The Ottomans also sometimes called the sanjak a liva (لوا, livâ) from the name's calque in Arabic and Persian.
Banners were a common organization of nomadic groups on the Eurasian Steppe including the early Turks, Mongols, and Manchus and were used as the name for the initial first-level territorial divisions at the formation of the Ottoman Empire. Upon the empire's expansion and the establishment of eyalets as larger provinces, sanjaks were used as the second-level administrative divisions. They continued in this purpose after the eyalets were replaced by vilayets during the Tanzimat reforms of the 19th century.