Nemichthys larseni is an eel in the family Nemichthyidae (snipe eels). It was described by and in 1978. It is a marine, deep water-dwelling eel which is known from the eastern Pacific Ocean, including Oregon and Hawaii, USA, Mexico, and the Gulf of California. It dwells at a depth range of 0 to 1,000 metres (0 to 3,281 ft). Males can reach a maximum total length of 161 centimetres (63 in). The species epithet "larseni" was given in honour of , credited with starting the study of the species at the University of Copenhagen.