Old Chiangmai–Bangkok Sign Language family

The Old Chiangmai–Bangkok Sign Language family is a language family of two related sign languages: Old Chiangmai Sign Language and Old Bangkok Sign Language. Woodward (2003) found that they were 65% cognate, indicating that the two languages are related, possibly due to migration between Chiangmai and Bangkok. There appear to be connections to sign languages of Vietnam (especially to Hai Phong Sign Language), and possibly Laotian sign languages, but the nature of these connections (whether areal or genetic) has not been determined. Village sign languages of Thailand, such as Ban Khor Sign Language, are unrelated.

Old Chiangmai–Bangkok Sign Language
Geographic distribution	Thailand
Linguistic classification	Possibly related to other sign languages of SE Asia
Subdivisions	Chiangmai Sign Old Bangkok Sign
Language codes
Glottolog	oldc1250