Caligus infestans is a species of sea louse in the family, Caligidae, first described by Camill Heller in 1865.

[1][2] In Australia it is found as an ecto-parasite (a parasite living on the outside of its host) of fishes at depths of 200 metres in the following IMCRA zones - Central Eastern Shelf Transition (39), Northeast Shelf Province (40), and the Northeast Shelf Transition - that is, in seas off the north east coast of Australia.

[1] A search of the Smithsonian Invertebrates Collection[3] reveals they have also been found off: and Madagascar and Mozambique (all with the same host).

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