Rabbi Eliyahu Essas (Hebrew: אליהו אסאס, Russian: Илья Цвиевич Эссас, Ilya Tsvievich Essas; born 1946) is a former leader of Soviet Jewry and one of the founders of Baal Teshuva movement in the Soviet Union.

Essas became interested in Human Rights and Jewish cause, while studying Mathematics in Vilnius University.

He created a network of Torah studies, children underground education and summer camps.

In January 1986, after political deals between Edgar Bronfman, Chairman of the World Jewish Congress, and the Soviet authorities, Essas' family moved to Israel.

Since 1999, Rabbi Essas works for Aish Hatorah in Jerusalem and is a founder of the Jewish Russian website evrey.com