Bey, also spelled as Baig, Bayg, Beigh, Beig, Bek, Baeg or Beg, is a Turkic title for a chieftain, and an honorific title traditionally applied to people with special lineages to the leaders or rulers of variously sized areas in the numerous Turkic kingdoms, emirates, sultanates and empires in Central Asia, South Asia, and the Middle East, such as the Ottomans, Timurids or the various khanates and emirates in Central Asia and the Eurasian Steppe. The feminine equivalent title was begum. The regions or provinces where "beys" ruled or which they administered were called beylik, roughly meaning "governorate" and/or "region". However the exact scope of power handed to the beks varied with each country, thus there was no clear-cut system, rigidly applied to all countries defining all the possible power and prestige that came along with the title.

बेग़ एक तुर्क उपनाम है जो प्रायः किसी समूह या दल के प्रमुख को लगाया जाता है। इनकी पत्नियों को बेग़म कहा जाता है। तुर्की में इसे बे भी कहा जाता है।