Abu'l-Harith Mansur II (Persian: منصور دوم سامانی) was Amir of the Samanids (997–999).

Shortly after he came to power, a rebellion was launched, and its leaders invited the Qarakhanids under Nasr Khan to intervene.

Nasr Khan did so, but he defeated the rebellion and contacted Fa'iq, who was then Mansur's governor of Samarkand.

Meanwhile, the general Baktuzun was sent by Mansur to retake control of Khurasan, which had recently fallen into the possession of the Ghaznavids.

[3] Nishapur was occupied, but Baktuzun was then attacked by Abu'l-Qasim Simjuri, the ruler of Kuhistan, in 998.