Yong (Nyong) is a Southwestern Tai language of Thailand.

It is used by Tai Yong people, who are descended from Tai Lue people from Xishuangbanna, China and Kengtung, Myanmar.

Ethnologue reports that Yong is phonologically similar to the Tai Lue language.

Yong has six tones: mid-rising, mid, low, high, mid-falling and high-falling.

As of 2019, there appears to be a generational change occurring where the high tone is merged with the high- and mid-falling tones due to language contact with Northern Thai and Standard Thai.