Isaiah ben Elijah di Trani (the Younger) (Hebrew: ישעיה בן אליהו דטראני) was an Italian Talmudist and commentator who lived in the 13th century and 14th century. He was the grandson, on his mother's side, of Isaiah (ben Mali) di Trani the Elder. He is usually quoted as ריא"ז (= "R. Isaiah Aḥaron, ז"ל"), or (ריב"א = "R. Isaiah ben Elijah").