Cosmocampus profundus (deepwater pipefish) is a species of marine fish of the family Syngnathidae.

It is found near the southeastern US, the Virgin Islands, and the Yucatan Peninsula of Mexico.

[1] The few specimens of this species that have been collected were found over sand and coral at depths of 100-265m.

This species is ovoviviparous, with males carrying eggs before giving birth to live young.

This Syngnathiformes-related article is a stub.