Blacktail triplefin is a common name for several species of fish in the threefin blenny family (Tripterygiidae) and may refer to:

• Enneapterygius bahasa, also known as the blacktail threefin, a species of threefin blenny known from reefs in the western Pacific Ocean
• Enneapterygius nigricauda, a species of triplefin blenny
• Enneapterygius similis, also known as black and red triplefin or masked threefin
• Helcogramma aquila

See also

Japanese blacktail triplefin, Springerichthys bapturus

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