Abu al-Hassan Ali al-Jaznai () (who lived in the 14th century) was a Maghrebi historian and author of Kitab Tarikh madinat Fas, al-maruf bi-Zahrat al-as fi bina madinat Fas or simply Zahrat al-As (The Myrtle Flower), a source on the history of the city Fes (in today's Morocco) and its inhabitants.
Ali al-Jaznai was born into the al-Jaznai family, a well-known medieval Berber family belonging to the Zenata Igzennayen (Jeznaya) tribe.