Rav Yosef bar Hiyya (Hebrew: רב יוסף בר חייא), or simply Rav Yosef, was a Babylonian rabbi of the third generation of amoraim.
When his teacher Judah died, Yosef was expected to take Judah's place as the gaon of the Pumbedita Academy, due to his excellent knowledge of rabbinic law (as opposed to Rabbah, who excelled in analysis rather than knowledge).
Yosef was accustomed to recite a sermon on Shabbat before the mussaf prayer.
[1] Despite being blind,[2] Yosef managed to accumulate an exceptional knowledge of both written and Oral Torah.
When some of the canonical Biblical translations were forgotten, he managed to restore them from his memory.