Oleg Ivanovich Zatsarinny (1953–2021) was a Ukrainian-American theoretical physicist noted for his contributions to all aspects of research related to electron scattering in atoms.

The title of his thesis was Inhomogeneous ferromagnetism of conducting magnetics with ions in a singlet ground state.

dissertation, he became a senior research associate at the Institute of Electron Physics of the Ukrainian Academy of Science, a position he would hold from 1993 – 2001.

[4] It contained many of his results on electron-ion collision cross sections for H-, He-, Li- and Be-like ions, obtained by different methods, including close-coupling and distorted-wave approaches.

After the collapse of the Soviet Union he started a collaboration with W. Mehlhorn at Freiburg University in Germany.