Elijah ben Solomon Zalman, (Hebrew: ר' אליהו בן שלמה זלמן Rabbi Eliyahu ben Shlomo Zalman), also known as the Vilna Gaon (Yiddish: דער װילנער גאון Der Vilner Goen; Polish: Gaon z Wilna, Gaon Wileński; or Elijah of Vilna, or by his Hebrew acronym Gr"a ("Gaon Rabbenu Eliyahu": "Our teacher Elijah the Genius"; Sialiec, April 23, 1720 – Vilnius October 9, 1797), was a Lithuanian Jewish Talmudist, halakhist, kabbalist, and the foremost leader of misnagdic (non-hasidic) Jewry of the past few centuries. He is commonly referred to in Hebrew as ha-Gaon mi-Vilna, "the genius from Vilnius".
Through his annotations and emendations of Talmudic and other texts, he became one of the most familiar and influential figures in rabbinic study since the Middle Ages. Although he is chronologically one of the Acharonim, some have considered him one of the Rishonim.