Which Mongolian languages have written forms?

Within the Mongolian language family, written forms are primarily associated with the central group of languages, while the outlying languages generally lack them.1

The central Mongolian languages that possess written forms include:

• Mongol: This language utilizes both the traditional Mongolian script—a vertical script of Syriac origin—and the Cyrillic script, which is used for Modern Mongolian in the country of Mongolia.23
• Buryat: This is a literary language written in the Cyrillic script.3
• Kalmyk: This is also a literary language written in the Cyrillic script.3
• Oirat: While spoken Oirat is similar to Kalmyk, its written form utilizes a variant of the traditional Mongolian vertical script.3

In contrast, outlying languages such as Moghol, Daur, Monguor (Tu), Dongxiang, and Bao’an (Bonan) do not have written forms. These languages are noted for retaining archaic features that have been lost in the central Mongolian languages.1