The Cerulean kingfisher (Alcedo coerulescens), is a species of river kingfisher in the Alcedinidae family. It is found in parts of Sumatra and Java, Indonesia. With an overall metallic blue impression, it is very similar to the common kingfisher, but it is white underneath instead of orange. This species is sometimes called the small blue kingfisher but in Indonesia and parts of Asia that name refers to Alcedo atthis (common kingfisher).