Sergey I. Bozhevolnyi (Russian: Сергей Иосифович Божевольный, born June 19, 1955) is a Russian-Danish physicist.

[1] Bozhevolnyi was raised in the village of Копанская [], Yeysky District, Krasnodar Krai, USSR and grew up in a family of teachers of physics and mathematics.

In 1981, he earned a PhD-degree from the same university with the thesis entitled "Study of electro-optical modulators and deflectors based on diffuse waveguides in LiNbO₃".

In 1998, he earned a Doctor of Science Degree at Aarhus University, Denmark, with his thesis entitled "Subwavelength apertureless light confinement".

[2] In 2006, together with professor Alexander Tishchenko at Jean Monnet University, he founded the Laboratory of Nano-Optics and Plasmonics in Moscow Institute of Physics and Technology[3] Since 2017, Bozhevolnyi is on the list of the most Highly Cited Researchers ( Clarivate / Thomson-Reuters[4]).