|Native to||China, Laos|
|ISO 639-3||None (|
Cosao (autonym: tsʰo˥sɔ˥; Chinese: 搓梭) is a Loloish language of China and Laos. The Cosao call themselves tsʰo˥sɔ˥, but are referred to by other ethnic groups as the Paijiao people (排角人). They are officially classified by the Chinese government as ethnic Hani people.
In northern Laos, there are 400 ethnic Cosao people in 2 villages in Phongsaly Province, namely Ban Nanli 板南里 (21°45′15″N 102°11′21″E) and Ban Shalue 板沙略 in Boun Tay District 乌德县 (Bai 2015:2-3). Ban Nanli is the older village of the two, since Cosao residents of Ban Shalue report that their ancestors had migrated from Ban Nanli. The two villages are located about 20 kilometers apart from each other.
There are 550 Cosao people total in both China and Laos. In China, Cosao speakers are classified as ethnic Hani.
Cosao is most closely related to the Khir language of Phongsaly Province, Laos. In turn, Cosao and Khir both belong to the Sila language cluster, which includes Sila, Sida, Phusang, Khir, and Cosao.
- Bai Bibo [白碧波]. 2015b. Documentation of endangered Cosao "green codes" in Yunnan, China. Presentation given at the 4th International Conference on Language Documentation and Conservation (ICLDC), Honolulu, Hawaii.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Cosao". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Bai (2015:1)
- Hsiu, Andrew. 2016. The classification of Cosao: a Lolo-Burmese language of China and Laos. Presented at the 22nd Himalayan Languages Symposium, Guwahati, India.