Abu Bakr al-Nassaj al-Tusi (d. 487/1094) was a leading Sufi master of Khurasan. He lived in Tus and was a disciple and successor of Abu al-Qasim al-Gurgani (d. 450/1058). His most renowned student was Ahmad al-Ghazali, who according to the TDV Encyclopedia of Islam ('Ahmed el-Gazzâlî') attended his scholarly circles; academic literature also records contact with Imam al-Ghazali. He is counted among the representatives of the ecstatic, love-centered Khurasani temperament, which through his student Ahmad al-Ghazali profoundly shaped Persian love mysticism. In the Mevlevi chain transmitted by Aflaki he is the link between Muhammad al-Zajjaj and Ahmad al-Ghazali (TDV, 'Mevleviyye'). His grave is traditionally placed in Tus, but as its location could not be verified by two independent sources, no map pin is given.