Archaeolamna (from Greek arche which turned into archaeo and Lamna, an extinct shark genus)[1] is an extinct genus of mackerel sharks that lived during the Cretaceous.

It contains three valid species (one with two subspecies) which have been found in Europe, North America, and Australia.

[7] Teeth of A. k. judithensis were found with a plesiosaur skeleton with bite marks from the Judith River Formation of Montana.

[1] It was a medium-sized shark with an estimated total body length of 3–4 metres (9.8–13.1 ft).

[7] When the family Archaeolamnidae was first named, it contained Archaeolamna, Cretodus, Dallasiella, and Telodontaspis.