Northeastern Vietnamese

Northeastern Vietnamese (Vietnamese: 方語東北, Bin'am: Fïëng Ngḯh Dong Bák) is the variety of spoken in Daidieu. Nearly 100% of the population of Daidieu is speaks Northeastern Vietnamese natively.

Although it is also spoken by the, it differs from other varieties spoken in , particularly in the writing system and to a lesser extent, phonology. Northeastern Vietnamese pronounciations were standarized by the Kingdom of Vietnam in the late 1940s and 1950s in dictionaries and are more conservative than other varieties. Written Vietnamese in Daidieu continues to use (Chinese characters) and  in contrast to Vietnam, where the  (chữ Quốc ngữ) is used. Despite this, Northeastern Vietnamese and other varieties remain mutually intelligible with each other.