Sadollah Nasiri Gheydari (Persian: سعدالله نصیری قیداری) is former President of Shahid Beheshti University of Tehran.

He is a physicist and professor at Shahid Beheshti University, Iran.

In 1993, he was transferred to Zanjan University where he held various positions including head of its Department of Physics from 1994 to 1996, rector of its College of Science from 1996 to 1998 and again from 2002 to 2004, and vice-chancellor of education from 1998 to 2001.

Gheydari's main research interests relate to oscillations of stars in the presence of magnetic fields, quantum mechanics in phase space, and coronal heating, as well as the selection of sites for optical observatories.

His work has included a formulation of quantum mechanics in extended phase space (phase space in position and momentum extended to include time and the value of the Hamiltonian as additional phase-space variables[3]).