The Aydinids or Aydinid dynasty (Modern Turkish: Aydınoğulları, Aydınoğulları Beyliği, Old Anatolian Turkish: آیدین اوغوللاری بیلیغی, also known as the Principality of Aydin and Beylik of Aydin (Aydın Beyliği), was one of the Anatolian beyliks and famous for its seaborne raiding.

The Beylik's capital was at first in Birgi, and later in Ayasoluk (present day Selçuk), and it was one of the frontier principalities established in the 14th century by Oghuz Turks after the decline of the Sultanate of Rûm.

Especially during the reign of Umur Bey, the sons of Aydın were a significant naval power of the time.

[1] The naval power of Aydin played a crucial role in the Byzantine civil war of 1341–1347, where Umur allied with John VI Kantakouzenos, but also provoked a Latin response in the form of the Smyrniote crusades, that captured Smyrna from the beylik.

The Beys of Aydin left important architectural works, principally in Birgi and Ayasoluk (Selçuk), their capital cities.