A lipstick tang, also known as a naso tang or orangespine unicornfish, is a type of fish from the 'acanthuridae' family. They are typically found in the western and central Pacific Ocean between Japan, Australia, New Caledonia and Hawaii.

The fish were first described in 1801 by Marcus Elieser Bloch (1723-1799) and Johann Gottlob Theaenus Schneider (1750-1822), two German naturalists. Lipstick tangs have an elongated body shape with a narrow tail. They are usually a dull brown in colour with a yellow line running from the back of the mouth up to the eye. The lips are an orangish colour, hence the name lipstick tang.

Their dorsal fins are striped black and white with a hint of blue. Their tails have a yellow band along the very end and the male fish develop streamer-like filaments from each corner. The male adults can reach up to 17.7 inches (45 cm), however, females are smaller. Lipstick tangs can live from 30 to 45 years depending on the quality of their environment.

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