The smooth lanternshark or slender lanternshark (Etmopterus pusillus) is a species of dogfish shark in the family Etmopteridae, found widely in the Atlantic and Pacific Oceans. It inhabits benthic environments at a depth of 274–1,000 m (899–3,281 ft), and pelagic environments at a depth of 0–708 m (0–2,323 ft).

The Smooth Lanternshark (Etmopterus pusillus) is a small (to 50.2 cm total length) deep-water shark known from a widespread yet patchy global distribution in the Atlantic and Indo-Pacific Oceans.