Averrhoa bilimbi (commonly known as bilimbi, cucumber tree, or tree sorrel) is a fruit-bearing tree of the genus Averrhoa, family Oxalidaceae. It is a close relative of carambola tree.

The bilimbi tree reaches 5-10 m in height. Its trunk is short and quickly divides up into ramifications. Bilimbi leaves, 3-6 cm long, are alternate, imparipinnate and cluster at branch extremities. There are around 11 to 37 alternate or subopposite oblong leaflets. The leaves are quite similar to those of the Otaheite gooseberry.

Possibly originated in Moluccas, Indonesia, the species are now cultivated and found throughout the Philippines, Indonesia, Sri Lanka, Bangladesh, Myanmar (Burma) and Malaysia. It is also common in other Southeast Asian countries. In India, where it is usually found in gardens, the bilimbi has gone wild in the warmest regions of the country.