Rafail Evseevich Krichevskii (Рафаил Евсеевич Кричевский, sometimes transliterated as "Krichevskiy" or "Krichevsky", born October 12, 1936, Kharkov) is a Russian mathematician and information theorist, now living in the United States.

He received his PhD degree in Theoretical Cybernetics in 1963.

In the late 90s he worked in University of California, Riverside, US.

Krichevsky–Trofimov estimator is widely used in source coding and bioinformatics.

[1][2] In 1986 Krichevskii was an Invited Speaker with talk Retrieval and data compression complexity at the ICM in Berkeley, California.