The beautiful nuthatch (Sitta formosa, sometimes called "Callisitta formosa") is a bird species in the family Sittidae, collectively known as nuthatches. It is a large nuthatch, measuring in length, that is not sexually dimorphic. Its coloration and markings are dramatic, the upper parts being black and azure, streaked with white and pale blue on the head and lined with the same colors on the wing feathers. The are orange, and the and are ochre. An irregular, dark highlights its eye. "S. formosa"s ecology is not fully described, but it is known to feed on small insects and larvae found on the trunks and epiphyte-covered branches of trees in its range. Reproduction takes place from April to May; the nest is placed in the hole of an oak, rhododendron, or other large tree. The nest is made of plant material and fur in which the bird typically lays four to six eggs.