The Cinnabar Hawk Owl (Ninox ios) a hawk owl 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.

Cinnabar Hawk Owl is small (total length 22 cm) and has a relatively long tail and narrow pointed wings. The known four records of the species indicate it is a nocturnal forest dwelling species living at mid-altitudes (1,100 "? 1,700 m). Otherwise very little is known of its habits. Based on morphological similarities with owlet-nightjars, Rasmussen suggests Cinnabar Hawk Owl may be an insectivore and prey on invertebrates in flight.