Hydrangea sargentiana is a species of flowering plant in the family Hydrangeaceae. It is native to western China.
This species is a shrub. It has prominent fleshy trichomes on the leaf and shoot surfaces, which are an important feature in identifying the species.
It may be confused with Hydrangea robusta <small>Hook.f. & Thomson</small>, which also has similar fleshy trichomes. Both species are placed within Hydrangea section Asperae.
The distribution is thought to be very narrow.