R. Aha b. Jacob (or R. Aha b. Ya'akov; Hebrew: רבי אחא בר יעקב, read as Rabbi Aha Bar Ya'akov) Was a Jewish Amora sage of Babylon, of the third and fourth generation of the Amora era. He was one of the disciples of Rav Huna. He was also one of the prominent Jewish leaders of Papunia. In the Talmud it is storied that he was a man of great piety and a great scholar.