Myroconger gracilis is an eel in the family Myrocongridae (thin eels). It was described by Peter Henry John Castle in 1991. It is a marine, deep-water dwelling eel which is known from the Kyushu-Palau Ridge in the northwestern Pacific Ocean. It dwells at a depth range of 320–640 m. Females are known to reach a maximum standard length of 47.7 cm. The species epithet gracilis refers to the slender body of the eel in comparison to Myroconger compressus (red eel).