Hezekiah ben Obadiah was a hypothetical ruler of the Khazars, probably in the mid ninth century CE. He was the son of Obadiah, the descendant of Bulan who brought rabbinical scholars to and built yeshivot in Khazaria. Nothing is known about Hezekiah's reign and the historical authenticity and accuracy of the only document mentioning his name has been questioned.^[1] As with other Bulanid rulers, it is unclear whether Hezekiah was Khagan or Khagan Bek of the Khazars, although the latter is more likely.

Hezekiah was succeeded by his son Menasseh I.