Ioan Ursu (born 5.04.1928) is a Romanian physicist and a member of the Romanian Academy (1974). He was born in Manastirea (Cluj county). He graduated from the Universities of Cluj and Princeton. In 1949-68 he worked at the University of Cluj (from 1960 as professor), from 1968 he has been a professor and head of a chair at the University of Bucharest, and in 1968-76 he was deputy director of the Institute of Atomic Physics.
His research was in the fields of atomic and nuclear physics, radiation materials science, solid-state physics and magnetism.
In 1969-76 he was president of the State
Committee for Nuclear Energy, and from 1980 he has been first deputy chairman of the National Council for Science and Technology of the SRR. In 1976-78 he was president of the European Physical Society.