The Battle of the Defile or Battle of the Pass is fought over three days in the Tashtakaracha Pass (in modern Uzbekistan) between a large Arab army of the Umayyad Caliphate and the Turkic Turgesh khaganate in July 731.

The Turgesh have been besieging Samarkand, and its commander, Sawra ibn al-Hurr al-Abani, sends a request for relief to the newly appointed governor of Khurasan, Junayd ibn Abd al-Rahman al-Murri.

Junayd's army is attacked by the Turgesh in the pass, and although the Umayyad army manages to extricate itself from the pass and reach Samarkand, it suffers enormous casualties (some 25,000–30,000 men), while Sawra's 12,000 men, who had been commanded to attack the Turgesh in the rear in a relief effort, are almost annihilated.

The battle, for which one of the most detailed accounts of the entire Umayyad era survives in al-Tabari, halts Muslim expansion into Central Asia for a decade.