The King Bird-of-paradise, Cicinnurus regius is a small, approximately 16 cm long, passerine bird of the Paradisaeidae (Bird-of-paradise) family. The male is a crimson and white with bright blue feet and green-tipped fan-like plumes on its shoulder. The two elongated tail wires are decorated with emerald green disk feathers on its tip. The unadorned female is a brown bird with barring below.
The King Bird-of-paradise is distributed throughout lowland forests of New Guinea and nearby islands. This so-called "living gem" is the smallest and most vividly colored among birds of paradise. The diet consists mainly of fruits and arthropods.
Widespread and a common species throughout its large habitat range, the King Bird-of-paradise is evaluated as Least Concern on the IUCN Red List of Threatened Species. It is listed on Appendix II of CITES.