The Mandarin orange, also known as mandarin or mandarine, is a small citrus tree (Citrus reticulata) with fruit resembling other oranges. The fruit is oblate, rather than spherical. Mandarin oranges are usually eaten plain, or in fruit salads. Specifically reddish orange mandarin cultivars can be marketed as tangerines, but this is not a botanical classification.

The tree is more drought-tolerant than the fruit. The mandarin is tender, and is damaged easily by cold. It can be grown in tropical and subtropical areas.