Star anise, or Chinese star anise, (Chinese: ??, pinyin: bajiao, lit. "eight-horn") is a spice that closely resembles anise in flavor, obtained from the star-shaped pericarp of Illicium verum, a small native evergreen tree of southwest China. The star shaped fruits are harvested just before ripening. It is widely used in Chinese cuisine, and to a lesser degree in South Asia and Indonesia. Star anise is an ingredient of the traditional five-spice powder of Chinese cooking. It is also one of the ingredients used to make the broth for the Vietnamese noodle soup called ph?.

Star anise contains anethole, the same ingredient which gives the unrelated anise its flavor. Recently, star anise has come into use in the West as a less expensive substitute for anise in baking as well as in liquor production, most distinctively in the production of the liquor Galliano.

Star anise has been used in a tea as a remedy for colic and rheumatism, and the seeds are sometimes chewed after meals to aid digestion.

Although it is produced in most autotrophic organisms, star anise is the industrial source of shikimic acid, a primary ingredient used to create the anti-flu drug Tamiflu. Tamiflu is regarded as the most promising drug to mitigate the severity of bird flu (H5N1); however, reports indicate that some forms of the virus have already adapted to Tamiflu.

A shortage of star anise is one of the key reasons why there is a worldwide shortage of Tamiflu (as of 2005). Star anise is grown in four provinces in China and harvested between March and May. The shikimic acid is extracted from the seeds in a ten-stage manufacturing process which takes a year. Reports say 90% of the harvest is already used by the Swiss pharmaceutical manufacturer Roche in making Tamiflu, but other reports say there is an abundance of the spice in the main regions - Fujian, Guangdong, Guangxi and Yunnan.

Japanese star anise (Illicium anisatum), a similar tree, is not edible because it is highly toxic; instead, it has been burned as incense in Japan. Cases of illness, including "serious neurological effects, such as seizures", reported after using star anise tea may be a result of using this species. Japanese star anise contains anisatin, which causes severe inflammation of the kidneys, urinary tract and digestive organs.