Khuseyn Gakayev, Russian commander (b. 1970)
Khuseyn Vakhaevich Gakayev (Russian: Хусейн Вахаевич Гакаев), also known as Emir Mansur (not to be confused with Amir Mansur, or Arbi Yovmurzaev, the Chechen nationalist commander killed in 2010) and Emir Hussein, was a mujahid Emir (commander) fighting in Chechnya. He was one of the most senior field commanders still operating in the North Caucasus prior to his death on 24 January 2013.In July 2011, Caucasus Emirate leader Dokka Umarov named Gakayev his naib (deputy) in the eastern sector of Chechnya, thus resolving the nearly year-long dispute that saw a number of nationalist field commanders break away from Umarov, with Gakayev serving as Emir of Vilayat Nokhchicho.

Gakayev was killed by Russian security forces along with his brother Muslim and nine other militants after they were surrounded in the mountains of Vedeno, Chechnya on 24 January 2013. The rebel website Kavkaz Center confirmed their deaths in a statement released on 25 January 2013.