富瓦烯（fulvalene）的分子式为C₁₀H₈，为萘的同分异构体之一。富瓦烯有两个环戊二烯结构。富瓦烯是富瓦烯类（fulvalenes）的一种。富瓦烯不具有芳香性。

• 富瓦烯类
• 四硫富瓦烯
• 富烯

Fulvalene (bicyclopentadienylidene) is the member of the fulvalene family with the molecular formula C₁₀H₈. It is of theoretical interest as one of the simplest non-benzenoid conjugated hydrocarbons. Fulvalene is an unstable isomer of the more common benzenoid aromatic compounds naphthalene and azulene. Fulvalene consists of two 5-membered rings, each with two double bonds, joined by yet a fifth double bond. It has D_2h symmetry.