Cosmocampus investigatoris (investigator pipefish) is a species of marine fish of the family Syngnathidae.

It is found in the Indo-West Pacific, from the Persian Gulf to the Gulf of Thailand.

[1] It lives over sand, mud, and coral bottoms to depths of 15m, where it can grow to lengths of 9 cm.

This species is ovoviviparous, with males carrying eggs in a brood pouch until giving birth to live young.

This Syngnathiformes-related article is a stub.