The Ag Qoyunlu or Ak Koyunlu; also called the White Sheep Turkomans (Azerbaijani: Agqoyunlular; Turkish: Akkoyunlular; Turkmen: Akgo齯nly; Persian: ?? ???????); was a Sunni Oghuz Turkic tribal federation that ruled parts of present-day Eastern Turkey; Armenia; Azerbaijan; northern Iraq; and Iran from 1378 to 1501.

The Aq Qoyunlu Turkomans first acquired land in 1402; when Timur granted them all of Diyar Bakr in present-day Turkey. For a long time; the Aq Qoyunlu were unable to expand their territory; as the rival Kara Koyunlu or 'Black Sheep Turkomans' kept them at bay. However; this changed with the rule of Uzun Hassan; who defeated the Black Sheep Turkoman leader Jahan Shah in 1467.

Following Sultan Ya'qub's death; civil war erupted; the Aq Qoyunlus destroyed themselves from within; and they ceased to be a threat to their neighbors. The Safavids and the Aq Qoyunlu met in battle at Nakhchivan in 1501; and the Safavid leader Ismail I forced the Aq Qoyunlu to withdraw.

In his retreat from the Safavids; the Aq Qoyunlu leader Alwand destroyed an autonomous splinter Aq Qoyunlu state in Mardin. The last Aq Qoyunlu leader; Murad; brother of Alwand; was also defeated by the same Safavid leader. Though Murad briefly established himself in Baghdad in 1501; he soon withdrew back to Diyar Bakr; signaling the end of the Aq Qoyunlu rule. Pictures From History Marie-Lan Nguyen