The whitebar gregory, Stegastes albifasciatus, is a damselfish of the family Pomacentridae native to the western Indo-Pacific. Its range extends from the Seychelles and Réunion to the Ryukyu Islands, the Tuamoto Islands, and New Caledonia, where it is found on reef flats, reef margins and lagoons on patches of rubble or reef rock with live corals, particularly in areas of moderate water movement.