Ahaziah of Judah (Hebrew: אֲחַזְיָה, ʼĂḥazyāh; Greek: Οχοζιας Okhozias; Latin: Ahazia) or Jehoahaz (2 Chronicles 21:17; 25:23), was a king of Judah, and the son of Jehoram and Athaliah, the daughter (or possibly sister) of king Ahab of Israel.

According to 2 Kings 8:26, Ahaziah was 22 years old when he became king of Judah and reigned for one year. However, 2 Chronicles 22:2 gives his age as 42 years when his reign began. Most scholars regard the 42 years in 2 Chronicles 22:2 as a copyist's error for an original 22 years. The age of 22 is also found in some Greek and Syrian versions of 2 Chronicles 22:2.

William F. Albright has dated his reign to 842 BC, while E. R. Thiele offers the date 841/840 BC. As explained in the Rehoboam article, Thiele's chronology for the first kings of Judah contained an internal inconsistency that placed Ahaziah's reign one year after his mother Athaliah usurped the throne. Later scholars corrected this by dating these kings one year earlier, so that Ahaziah's dates are taken as one year earlier than Thiele's in the present article.

Ahaziah was the youngest son of Jehoram of Judah. According to 2 Chronicles 21:16-17, his older brothers had been carried off in a Philistine and Arab raid.

Under the influence of his mother Athaliah, Ahaziah introduced forms of worship that offended the Yahwistic party.

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