Seifallah Randjbar-Daemi (Persian: سیف الله رنجبر دائمی, born 1950) is an Iranian theoretical physicist.

He collaborated with Abdus Salam very closely at both scientific and humanitarian level since his student days at Imperial College.

[2] He joined the International Centre for Theoretical Physics(ICTP) in 1988 as Research Physicist and Coordinator of the High energy Section.

Since April 2011, he served as the acting deputy director until his retirement on 31 December 2015.

[3] Because of his outstanding contributions in promoting science and technology in the developing countries, he received the Spirit of Abdus Salam Award in the year of 2016.