Diaphus ostenfeldi, also known as Ostenfeld's lanternfish, is a species of lanternfish found worldwide.Hulley, P.A., 1990. Myctophidae. p. 398-467. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon; SEI; Paris; and UNESCO, Paris. Vol. 1.

Description This species reaches a length of .

Etymology The fish is named in honor of the late Carl Hansen Ostenfeld (1873–1931), a Danish botanist and the chairman of the committee that edited the oceanographic reports of the Dana expeditions.

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