Salix eastwoodiae is a species of willow known by the common names mountain willow, Eastwood's willow, 'and Sierra willow. It is native to the northwestern United States, where it grows in subalpine and alpine climates in mountain habitats such as talus and streambanks. It is a shrub growing up to 4 m (13 ft) tall, with branches yellowish, brown, red, or purplish in color and coated in short hairs, sometimes becoming hairless. The leaves are narrowly or widely lance-shaped and up to 10 cm long, hairy when new and becoming hairless. The inflorescence is a catkin of flowers. It is a shrub growing up to 4 m (13 ft) tall, with branches yellowish, brown, red, or purplish in color and coated in short hairs, sometimes becoming hairless. The leaves are narrowly or widely lance-shaped and up to 10 cm long, hairy when new and becoming hairless. The inflorescence is a catkin of flowers.