双环戊二烯（简称DCPD），又称二聚环戊二烯，是环戊二烯经狄尔斯－阿尔德反应而生成的二聚体，有内型与外型两种异构体。

无色结晶，有类似樟脑气味。溶于醇、醚和四氯化碳，不溶于水。因分子中含有多个不饱和双键，因此化学性质非常活泼，易于进行各类加成和聚合反应，生成种类繁多的衍生物。

Dicyclopentadiene, abbreviated DCPD, is a chemical compound with formula C₁₀H₁₂. At room temperature, it is a white crystalline solid with a camphor-like odor. Its energy density is 10,975 Wh/l. Dicyclopentadiene is coproduced in large quantities in the steam cracking of naphtha and gas oils to ethylene. The major use is in resins, particularly, unsaturated polyester resins. It is also used in inks, adhesives, and paints.