Salix kusanoi is a species of willow in the family Salicaceae. It is endemic to Taiwan. It is threatened by habitat loss.

It is a deciduous shrub or small tree growing to 6 m (20 ft) tall. The leaves are alternate, 9 cm long and 4 cm broad, with an entire margin; they are green above, and paler below with fine silky hairs along the veins. The flowers are produced in catkins in early spring before or as the new leaves appear; it is dioecious, with male and female catkins on separate plants. The male catkins are 8–9 cm long; the female catkins are 3 cm long.