Husayn Bayqarah (1438 – May 4, 1506) (Persian حسین بایقرا) was a Timurid ruler of Herat from 1469 to 1506, with a brief interruption in 1470. His father was Mansur, a great-grandson of Timur. He is also referred to as Sultan-Husayn Mirza (Baburnama).

Mansur died when Husayn Bayqarah was around seven or eight years of age; the latter ended up in the service of Babur Ibn-Baysunkur, ruler of Herat, in 1452. Following Babur's death in 1457 and the subsequent invasion of Khurasan by the Timurid ruler of Samarkand, Abu Sa'id, Husayn adopted the life of a mercenary. After a while, he decided to fight for himself and wrested Gurgan (or Gorgan) from the Black Sheep Turkmen. Later on he would conquer Mazandaran. At first submissive to Abu Sa'id, he took advantage of the Samarkand ruler's attempts to put down a revolt in Transoxiana in 1460; by the following year he was laying siege to Herat, which had fallen into Abu Sa'id's hands in 1459. However, he was soon defeated and forced to take refuge in Khwarazm, from which he began making pillaging raids into Khurasan; these raids were conducted in earnest starting in 1464. Seeking to protect himself against Abu Sa'id, he received the help of the Uzbeks.