Deutzianthus tonkinensis (Vietnamese: mọ or giát) is a species of small tree up to 12 metres (39 ft) tall in the family Euphorbiaceae.

It is found in southern China (SW Guangxi, S Yunnan) and northern Vietnam.

[2] The species is under second-class national protection in China.

[3] Within Nonggang Natural Reserve in southern Guangxi, D. tonkinensis is the dominant tree species; however, its young leaves contributed only a minor proportion to the diet of the herbivorous monkey François' langur.

Its light wood was used to make furniture, chests, stationery products, match sticks, and clogs.