Leptochilichthys agassizii, or Agassiz' smooth-head, is a species of fish in the family Alepocephalidae.

[3][4] 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.

[5] Leptochilichthys agassizii is brownish in colour, with a large head.

[8] It has large scales, with 47–52 in its lateral line.

[10][11] It lays large eggs, up to 8.5 mm (0.33 in) in diameter.