Ahimaaz (Hebrew: אֲחִימַעַץ ʾĂḥīmaʿaṣ, "My Brother Is Counselor") was son of the high priest Zadok.
During Absalom's revolt he remained faithful to David, and, along with Jonathan, son of Abiathar, assisted him by giving him news about the proceedings of Absalom in Jerusalem (2 Samuel 15:24–37; 17:15–21).
He was a swift runner, and was the first to bring David news of the defeat of Absalom, although he refrained from mentioning his death (2 Samuel 18:19–33).
Under King Solomon (c. 970–930 BCE), Ahimaaz's father Zadok became high priest.
Subsequent kings of Israel, Ahaz, also married daughters of the high priest.