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.

Hejazi Arabic or Hijazi Arabic (HA), also known as West Arabian Arabic, is a variety of Arabic spoken in the Hejaz region in Saudi Arabia. Strictly speaking, there are two main groups of dialects spoken in the Hejaz region, one by the urban population, originally spoken mainly in the cities of Jeddah, Mecca, Medina and partially in Ta'if and another dialect by the urbanized rural and bedouin populations. However, the term most often applies to the urban variety which is discussed in this article.