Old Hejazi, is a variety of Old Arabic attested in Hejaz from about the 1st century to the 7th century. It is the variety thought to underlie the Quranic Consonantal Text (QCT) and in its later iteration was the prestige spoken and written register of Arabic in the Umayyad Caliphate.

Old Arabic is the name for any Arabic language or dialect continuum before Islam. Various forms of Old Arabic are attested in scripts like Safaitic, Hismaic, Nabatean, and even Greek.