Helcogramma ascensionis, the Ascension triplefin, is a species of triplefin blenny in the genus Helcogramma. it was described by Roger Lubbock in 1980. It has been recorded at depths of 0mto5mm (00feetto16feetm) in tidal pools and rocky reefs around the islands of Saint Helena and Ascension in the south eastern Atlantic Ocean.