Salix caprea, known as goat willow, pussy willow or great sallow, is a common species of willow native to Europe and western and central Asia.

It is a deciduous shrub or small tree, reaching a height of 8–10 m (26–33 ft), rarely to over 20 m, with the tallest specimen reported being 26.2 m tall, in Nuuksio National Park in Finland.

The leaves are 3–12 cm long and from 2.5–8 cm wide, broader than most other willows, dull green and slightly hairy above, grey and woolly pubescent below.

The flowers are soft silky, and silvery 3-7-cm-long catkins are produced in early spring before the new leaves appear; the male and female catkins are on different plants (dioecious). The male catkins mature yellow at pollen release, the female catkins mature pale green.

The fruit is a small capsule 5–10 mm long containing numerous minute seeds embedded in fine, cottony hairs. The seeds are very small (about 0.2 mm) with the fine hairs aiding dispersal; they require bare soil to germinate.

The two varieties are:

The Latin specific epithet caprea means "goat". This, and the common name goat willow, probably derive from the first known illustration of the species in Hieronymus Bock's 1546 Herbal, where the plant is shown being browsed by a goat. The species was historically also widely used as a browse for goats, to which Bock's illustration may refer.

S. caprea occurs both in wet/damp environments, such as riverbanks and lake shores, and in drier sites, wherever bare soil becomes available due to ground disturbance.