Ilyophis nigeli is an eel in the family Synaphobranchidae (cutthroat eels). It was described by Yuri Nikolaevich Shcherbachev and Kenneth J. Sulak in 1997. It is a marine, deep water-dwelling eel which is known from Japan, in the northwestern Pacific Ocean. It is known to dwell at a depth range of 700 to 1,800 metres (2,300 to 5,900 ft). Males can reach a maximum total length of 51.3 centimetres (20.2 in).

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