Corythoichthys nigripectus (black-breasted pipefish) is a species of marine fish of the family Syngnathidae.

It is found in the Indo-Pacific, from the Red Sea, Indonesia and the Philippines to the Society Islands, Guam and New Caledonia.

[1] It inhabits coral reefs and algae patches at depths of 5–30 metres (16–98 ft), where it can grow to lengths of 11 centimetres (4.3 in).

[2] This species is both monogamous and ovoviviparous, with males carrying eggs and giving birth to live young.

This Syngnathiformes-related article is a stub.