The Monguor language (Chinese: 土族语; pinyin: Tǔzúyǔ; also written Mongour and Mongor) is a Mongolic language of its Shirongolic branch and is part of the Gansu–Qinghai sprachbund (also called the Amdo sprachbund). There are several dialects, mostly spoken by the Monguor people. A writing system was devised for Huzhu Monguor (Mongghul) in the late 20th century but has been little used.

A division into two languages, namely Mongghul in Huzhu Tu Autonomous County and Mangghuer in Minhe Hui and Tu Autonomous County, is considered necessary by some linguists. While Mongghul was under strong influence from Amdo Tibetan, the same holds for Mangghuer and Sinitic languages, and local varieties of Chinese such as the Gangou language were in turn influenced by Monguor.

Phonology

Vowels

• Vowel sounds may also be nasalized when preceding a nasal consonant, in different environments.
• Vowels /i, e, u/ may also undergo a devoicing process in certain phonetic environments.

Consonants

• /χ/ can also be heard as allophones [h] or [x], occurring in free variation.
• /ɻ/ can be heard as a voiced fricative [ʐ] within the onset of a stressed syllable, or of a word-initial syllable. It can also be heard as a flap sound [ɾ] intervocalically in the onset of an unstressed syllable. In a syllable-coda position, it is heard as a rhotic [ə˞] vowel sound.
• /j/ can have a spirantized allophone of [ʝ] strongly in stressed syllables.^[3]

Numerals

Mongolian numerals such as the following^[4] are only in use in the Mongghul dialect, while Mangghuer speakers have switched to counting in Chinese.^[4] Note that while the Mongolian script has only arban for 'ten', Middle Mongolian *harpa/n including *h can be reconstructed from the scripts.^[5]