Thinouia is a genus of flowering plants belonging to the family Sapindaceae. It is also in the Sapindoideae subfamily and Paullinieae tribe.

Its native range is parts of Central America (within Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico and Panamá) and South America (within (northern) Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru and Venezuela).

The genus name of Thinouia is in honour of André Thouin (1747–1824), a French botanist. It was first described and published by George Bentham in London J. Bot. Vol.4 on page 633 in 1845.

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