Chlamydoselachus is a genus of sharks and the sole extant member of the family Chlamydoselachidae, in the order Hexanchiformes.

It is known as a living fossil, along with Chlamydoselachus africana, also known as the southern African frilled shark, which is only found along coastal areas of South Africa.

The only two extant species of this genus are deep-sea creatures which are typically weakened in areas closer to the surface.

[2] The earliest known fossil members of the genus are C. gracilis from Angola and C. balli from Canada, both from the Campanian stage of the Late Cretaceous.

It is one of the largest frilled sharks known to have existed, with estimated body length of 3.80 metres (12.5 ft).