Cinchona or Quina is a genus of about 38 species in the family Rubiaceae, native to the tropical Andes forests of western South America. They are medicinal plants, known as sources for quinine and other compounds.

The name of the genus is due to Carolus "Carl" Linnaeus, who named the tree in 1742 after a Countess of Chinchón, the wife of a viceroy of Peru, who, in 1638, was introduced by native Quechua healers to the medicinal properties of cinchona bark. Stories of the medicinal properties of this bark, however, are perhaps noted in journals as far back as the 1560s–1570s.

The Cinchona plants are large shrubs or small trees with evergreen foliage, growing 5–15 metres (16–49 ft) in height. The leaves are opposite, rounded to lanceolate and 10–40 cm long.

The flowers are white, pink or red, produced in terminal panicles. The fruit is a small capsule containing numerous seeds.