Rav Aha bar Jacob (or R. Aha bar Ya'akov; Hebrew: רבי אחא בר יעקב) was an Babylonian rabbi of the third and fourth generations of Amoraim.

He was one of the disciples of Rav Huna.^[1] He was also one of the prominent Jewish leaders of Papunia.^[2] In the Talmud it is said that he was a man of great piety and a great scholar.^[3]