Gardenia is a genus of 142 species of flowering plants in the coffee family, Rubiaceae, native to the tropical and subtropical regions of Africa, southern Asia, Australasia and Oceania.

The genus was named by Carl Linnaeus after Dr. Alexander Garden (1730-1791), a Scottish-born American naturalist.

They are evergreen shrubs and small trees growing to 1-15 metres (3.3-49 ft) tall. The leaves are opposite or in whorls of three or four, 5-50 centimetres (2.0-20 in) long and 3-25 centimetres (1.2-9.8 in) broad, dark green and glossy with a leathery texture.

The flowers are solitary or in small clusters, white, or pale yellow, with a tubular-based corolla with 5-12 lobes (petals) from 5-12 centimetres (2.0-4.7 in) diameter. Flowering is from about mid-spring to mid-summer and many species are strongly scented.