Classical Armenian orthography

Classical Armenian orthography, traditional orthography or Mashtotsian orthography (Հայերէնի դասական ուղղագրութիւն in classical orthography and Հայերենի դասական ուղղագրություն in reformed orthography, Hayereni tasagan ughakrutyun), is the orthography that was developed by Mesrop Mashtots in the 5th century for writing Armenian and reformed during the early 20th century. Today, it is used primarily by the Armenian diaspora, including all Western Armenian speakers and Eastern Armenian speakers in Iran, which has rejected the Armenian orthography reform of Soviet Armenia during the 1920s. In the Armenian diaspora, some linguists and politicians allege political motives behind the reform of the Armenian alphabet.

Classical Armenian orthography uses 38 letters: the original 36 letters of the Armenian alphabet invented by Mesrop Mashtots during the 5th century, and the 2 additional letters included later in the Armenian alphabet during the Middle Ages.