Leptochilichthys agassizii, or Agassiz' smooth-head, is a species of fish in the family Alepocephalidae. It is named for the scientist and engineer Alexander Agassiz (1835–1910), who commanded the 1899 survey aboard the USS Albatross on which the fish was discovered.
Description Leptochilichthys agassizii is brownish in colour, with a large head. Its maximum length is . It has large scales, with 47–52 in its lateral line.
Habitat Leptochilichthys agassizii lives in the Atlantic Ocean, Indian Ocean and Pacific Ocean; it is bathypelagic, living at depths of .
Reproduction It lays large eggs, up to in diameter.
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