Hedera, commonly called ivy (plural ivies), is a genus of 12–15 species of evergreen climbing or groundcreeping woody plants in the family Araliaceae, native to western, central and southern Europe, Macaronesia, northwestern Africa and across centralsouthern Asia east to Japan and Taiwan.

Ivies are very popular in cultivation within their native range and compatible climates elsewhere, for their evergreen foliage, attracting wildlife, and for adaptable design uses in narrow planting spaces and on tall or wide walls for aesthetic addition, or to hide unsightly walls, fences and tree stumps. Numerous cultivars with variegated foliage and/or unusual leaf shapes have been selected for horticultural use.

The berries are moderately toxic. Ivy foliage contains triterpenoid saponins and falcarinol. Falcarinol is capable of inducing contact dermatitis. It has also been shown to kill breast cancer cells.