The Sailfin snake-eel (Letharchus rosenblatti) also known as the Black sailfin eel in Mexico,) is an eel in the family Ophichthidae (worm/snake eels). It was described by John E. McCosker in 1974. It is a marine, tropical eel which is known from the eastern central and southeastern Pacific Ocean, including Colombia, Ecuador, Costa Rica, Panama and Mexico. It dwells at a depth range of 0 to 17 metres (0 to 56 ft), and inhabits sand sediments. Males can reach a maximum total length of 31 centimetres (12 in).

Due to a lack of known major threats and lack of observed population decline, the IUCN redlist currently lists the Sailfin snake-eel as Least Concern.

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