杜仲（学名：Eucommia ulmoides），又名胶木，为杜仲科植物。

落叶乔木，可高达15米；体含硬性橡胶，树皮折断引伸，露出细丝；长椭圆形叶子互生，无托叶，长8－16厘米，叶缘呈锯齿状；春季开花，花单性，无花被，雌雄异株，雄花簇生，由10个雄蕊组成，雌花单生，有梗；长椭圆状扁平的果实为单翅果，长2－3厘米，宽1－2厘米，果期6－11月。

Eucommia ulmoides is a species of small tree native to China. It belongs to the monotypic family, Eucommiaceae. It is near threatened in the wild, but is widely cultivated in China for its bark and is highly valued in herbology such as Traditional Chinese medicine.