The cinnamon ibon (Hypocryptadius cinnamomeus) is a species of bird endemic to the mountains of Mindanao in the Philippines.

Voice is a mixture of high-pitched squeals, a sharp nasal 'wik', and a forceful, medium-pitched 'piii!

"[3] Monotypic within the genus Hypocryptadius, it is classified as a sparrow after being tentatively placed in the white-eye family Zosteropidae.

[2] It has a skull and bill similar to that of the sparrows, and following a study of its mitochondrial and nuclear DNA as well as skeletal evidence, Jon Fjeldså and colleagues placed the species as the most basal member of that family and a distinct subfamily.

[2] Forages in the understory for insects and often joins mixed-species flocks that include Black-and-cinnamon fantail, Little pied flycatcher, Turquoise flycatcher, Negros leaf warbler and other small birds.