The Philippine butterflyfish, Chaetodon adiergastos, is a species of butterflyfish (family Chaetodontidae). It is found in the western Pacific, from the Ryukyu Islands and Taiwan to Java and northwestern Australia. It grows to a maximum length of 20 cm (nearly 8 in). The body is white with diagonal brown stripes on the sides. The dorsal, caudal, anal and pelvic fins are yellow. There are rounded broad black bands on the face, covering the eye, but not continuous from one side of the body to the other but with a separate black spot centered on the forehead.