Boris Semyonovich Tsirelson (May 4, 1950 – January 21, 2020) (Hebrew: בוריס סמיונוביץ' צירלסון, Russian: Борис Семёнович Цирельсон) was a Russian–Israeli mathematician and Professor of Mathematics at Tel Aviv University in Israel, as well as a Wikipedia editor.

He obtained his Master of Science from the University of Leningrad and remained there to pursue graduate studies.

He obtained his Ph.D. in 1975, with thesis "General properties of bounded Gaussian processes and related questions" written under the direction of Ildar Abdulovich Ibragimov.

[1] Later, he participated in the refusenik movement, but only received permission to immigrate to Israel in 1991.

[3] Tsirelson made notable contributions to probability theory and functional analysis.