Nusach Ari means, in a general sense, any prayer rite following the usages of Rabbi Isaac Luria, the Holy AriZal who lived in the 16th century, and, more particularly, the derivative version of it used by Chabad Chasidim.

In 1803, Rabbi Schneur Zalman of Liadi, the holy the “Baal HaTanya” and founder of Chabad Hasidism, published a prayer book that was arranged according to (Sephardic-Kabbalistic) Nusach HaAri, amalgamated with the new-risen 18th-century Hasidic Nusach Sefard (and his own). This early 19th-century devised prayer rite has been used ever since by Lubavitch Chabad Chasidim.