The Oxalidaceae, or wood-sorrels, are a family of five genera of herbaceous plants, shrubs and small trees, with the great majority of the 570 species in the genus Oxalis. Members of this family typically have divided leaves, with the leaflets showing "sleep movements", spreading open in light and closing in darkness.

The genus Averrhoa, of which the starfruit tree is a member, is usually included in this family (e.g. in APG IV), but some botanists place it in a separate family, Averrhoaceae.