The whitemargin moray or the white-edged moray, Gymnothorax albimarginatus, is a species of marine fish in the family Muraenidae.
The whitemargin moray is considered as a medium-sized fish which can reach 105 cm long. Its snout is rounded. Its body coloration can vary off-white to beige with a characteristic white margin on the outer edge of the dorsal fin that runs through its body from the back of the skull to the tip of the tail.
The whitemargin moray is widespread throughout the tropical waters of Indo-Pacific area from the eastern part of Indonesia to the oceanic islands in the Ocean Pacific, including Hawaii and Polynesia; and from South Japan down to Tonga Islands.
This moray lives on the sandy slopes of the coastal reefs.
The whitemargin moray is a benthic animal that lives during daytime buried in the sand or between coral blocs and comes out the evening to hunt prey. Its bite is venomous.