六鳃鲨目(学名:Hexanchiformes)是板鳃类的一目,有6至7个鳃孔(一般鲨鱼只有五个),一个背鳍,现存共有两科:
在日本二叠纪地层以及南极洲、澳洲泥盆纪地层沉积物中发现了类似于现代六鳃鲨目物种的鲨鱼牙齿化石。如果确认为六鳃鲨目物种的话,则六鳃鲨目可能为现存唯一存活过二叠纪-三叠纪灭绝事件的板鳃亚纲,同时也会是现存板鳃亚纲中最古老的目。
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