垂柳（学名：Salix babylonica）是杨柳科柳属的植物。别名“垂枝柳”、“倒挂柳”、“倒插杨柳”。

落叶乔木，高可达18米，胸径1米，树冠倒广卵形，小枝细长下垂；披针形或线状披针形叶片，有锯齿；早春先叶开花，雌雄异株，葇荑花序直立；蒴果，种子小，有白色丝状长毛。

Salix babylonica (Babylon willow or weeping willow; Chinese: 垂柳) is a species of willow native to dry areas of northern China, but cultivated for millennia elsewhere in Asia, being traded along the Silk Road to southwest Asia and Europe.