Haliotis jacnensis, commonly known as the Jacna abalone, is a species of sea snail in the abalone family, Haliotidae. It is found in the western Pacific Ocean at depths between sea level and 50 metres (160 ft), around the coasts of American Samoa, Fiji, Guam, Indonesia, Japan, Micronesia, New Caledonia, Niue, the Northern Mariana Islands, the Philippines, the Solomon Islands, Tonga, Tuvalu and Vanuatu. H. jacnensis features an oblong–ovate shell that varies in size between 7 to 25 millimetres (0.28 to 0.98 in). The shell is reddish-orange with a silvery interior and features irregular scaly ridges. This picture shows five views of a H. jacnensis shell, 18 millimetres (0.71 in) in length, found on Masbate Island in the Philippines.