A'ou (阿欧方言) orRed Gelao (红仡佬语) is an endangeredGelao language spoken by fewer than 100 people inGuizhou,China.^[2] Only the Hongfeng (红丰) and Bigong (比贡)dialects are still spoken, each with only a few dozen speakers.

The main dialects of A'ou, which all have limitedmutual intelligibility, are:

• Hongfeng (红丰)^[3]
• Bigong (比贡)^[4]
• Qiaoshang (桥上)^[5] (extinct)

Only one elderly speaker of the Houzitian (猴子田) dialect was found in 2013, and it is likely now extinct.^[6]

Mulao (木佬) is sometimes also included, in addition toYi (羿), an extinct A'ouvariety ofSichuan.^[7]

• Consonant clusters may include /pl, bl, vl, ml/.
• /d/ may have an allophone of [ˀl], heard in free variation.
• Nasal sounds /m, n, ŋ/ may be heard as prenasal sounds [ᵐb, ⁿt, ᵑɡ] when in combination with low tones in initial position.
• /χ/ may also be heard as velar [x] in free variation.

• Sounds /ə, ɯ, ɤ/ are only heard when in vowel diphthongs /əu, aɯ, əɯ, ɤu/ or triphthongs /iəɯ, iəu, uəɯ/.
• /ə/ only rarely occurs as a monophthong.
• /ɛ/ may also be heard as [e] in free variation.^[4]

• Kra languages
• Languages of Guizhou
• Kra–Dai language stubs

• Language articles citing Ethnologue 25
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