六鳃鲨科（学名Hexanchidae）是板鳃亚纲六鳃鲨目的其中一科。

六鳃鲨科下分3个属，如下：

• 七鳃鲨属(Heptranchias)
  • 尖吻七鳃鲨(Heptranchias perlo)
• 六鳃鲨属(Hexanchus)
  • 灰六鳃鲨(Hexanchus griseus)
  • 大眼六鳃鲨(Hexanchus nakamurai)：又称长吻六鳃鲨。
• 哈那鲨属(Notorynchus)
  • 扁头哈那鲨(Notorynchus cepedianus)：又称油夷鲛。

Cow sharks are a family, the Hexanchidae, of sharks characterized by an additional pair or pairs of gill slits. Its 37 species are placed within the 10 genera Gladioserratus, Heptranchias, Hexanchus, Notidanodon, Notorynchus, Pachyhexanchus, Paraheptranchias, Pseudonotidanus, Welcommia, and Weltonia.