Kumquats or cumquats are a group of small fruit-bearing trees in the flowering plant family Rutaceae, either forming the genus Fortunella, or placed within Citrus sensu lato.

The fruit is small and usually round but can be oval shaped and is bright orange when fully ripe. They are much hardier than other citrus plants such as oranges. The peel has a sweet flavor but the fruit has a sour center. The fruit is eaten whole, skin and all. The inside is still quite sour, but the skin has the sweeter flavor, when eaten together it produces an unusual tart-sweet, refreshing flavor. The fruit can be eaten cooked but is mainly used to make marmalades and jellies.