The common false moray, false moray, grey reef eel, or plain false moray, (Kaupichthys diodontus), is an eel in the family Chlopsidae. It was described by Leonard Peter Schultz in 1943. It is a tropical, marine eel which is known from seaward reefs in the Indo-Pacific regions. It typically dwells at a depth around 56 m. Males can reach a maximum total length of 30 cm.