The pomacanthid fish Centropyge nahackyi is described from specimens collected at Johnston Atoll at depths between 35-45 m. It is most similar to C. multicolor of the central Pacific, differing in color pattern and character state values. Centropyge nahackyi is dark brown dorsally and posteriorly, and has a yellow abdomen, head, and caudal peduncle; alternating bars of blue and black on the nape extend posteriorly past the dorsal origin.