Sapindus mukorossi, commonly known as Indian soapberry, washnut, ritha or Chinese soapberry, is a species of tree in the family Sapindaceae. It is a deciduous tree that grows in the lower foothills and midhills of the Himalayas at altitudes of up to 1,200 metres (4,000 ft). It is also native to western coastal Karnataka, Maharashtra, and Goa in India; as well as Nepal Indochina, southern China, Japan and Taiwan as known by its many indigenous peoples. It is tolerant to reasonably poor soil, can be planted around farmers' homes, and one tree can produce 30 to 35 kilograms (66 to 77 lb) of fruit per year.

The soapnut contains saponin, which has soap-like properties.

The fruit can be used in an enhanced oil recovery technique, yielding a surfactant for washing arsenic from soils containing iron.

Due to its saponin content, the extract exhibits antibacterial activity in vitro.

Media related to Sapindus mukorossi at Wikimedia Commons