榛（学名：Corylus heterophylla）为桦木科榛属的植物。

落叶灌木或小乔木；幼枝有软毛及腺毛；圆卵形至倒卵形的叶子，顶端稍平截，有长尖头，边缘有不规则锯齿和小裂片；早春先叶开花，雌雄同株，雄花排列成柔荑花序，雌花包于花芽内，仅露红色花柱，花黄褐色；小坚果近球形，托有钟状总苞，总苞较坚果长，具有6－9个三角形裂片，果实叫榛子，果皮坚硬，果仁可食；花期为3一4月，11月结果。

Corylus heterophylla, the Asian hazel, is a species of hazel native to eastern Asia in northern and central China, Korea, Japan, and southeastern Siberia.

It is a deciduous shrub or small tree growing to 7 m tall, with stems up to 20 cm thick grey bark. The leaves are rounded, 4–13 cm long and 2.5–10 cm broad, with a coarsely double-serrated to somewhat lobed margin and an often truncated apex. The flowers are wind-pollinated catkins; the male (pollen) catkins are pale yellow, 4 cm long, while the female catkins are bright red and only 1–3 mm long. The fruit is a nut produced in clusters of 2–6 together; each nut is 0.7–1.5 cm diameter, partly enclosed in a 1.5–2.5 cm long, bract-like involucre (husk).