Ahmad ibn Muzahim ibn Khaqan (Arabic: أحمد بن مزاحم بن خاقان) was the military governor (wālī al-jaysh) of Egypt for the Abbasid dynasty for a part of 868.
The son of Muzahim ibn Khaqan, Ahmad succeeded his father as governor following the latter's death. After holding the post for only two months, however, Ahmad died himself of unspecified causes. Azjur al-Turki, who had served as chief of police under both Muzahim and Ahmad, then became governor.