休克尔苯（Hückel benzene），又称盆苯（Benzvalene），有时在中国大陆一些文献以及化学考试卷中也作盆烯，是苯的价键异构体。1937年德国化学家休克尔发现，故取名为休克尔苯。休克尔苯性质不稳定，在室温即定量转变为苯。半衰期为10天。也可以看作苯的共振式。1971年，Thomas J. Katz等人成功合成了休克尔苯。

1971年的合成路线是在二甲醚中用甲基锂与环戊二烯反应（温度为 -45°C）。溶液中的烃具有非常难闻的气味。因为这种物质存在很大的空间位阻应变，纯物质很容易爆炸，甚至受到摩擦时都会发生。

Benzvalene is an organic compound and one of several isomers of benzene. It was synthesised in 1971 by Thomas J. Katz et al.

The 1971 synthesis consisted of treating cyclopentadiene with methyllithium in dimethyl ether and then with dichloromethane and methyllithium in diethyl ether at −45 °C. The hydrocarbon in solution was described as having an extraordinary mephitic odor. Due to the high steric strain present in benzvalene, the pure compound easily detonates, for example by scratching.