The Cinnabar boobook (Ninox ios), also known as the cinnabar hawk owl, is a species of boobook endemic to the island of Sulawesi, Indonesia. It was described as a new species to science by American ornithologist Pamela C. Rasmussen in 1999 based on a single specimen collected by Frank Rozendaal from Bogani Nani Wartabone National Park on Minahassa Peninsula, northern Sulawesi, in 1985. Subsequently it has also been observed in Lore Lindu National Park in central Sulawesi, greatly expanding the known habitat range.