Hedera helix (common ivy, English ivy, European ivy, or just ivy) is a species of flowering plant in the family Araliaceae, native to most of Europe and western Asia. A rampant, clinging evergreen vine, it is a familiar sight in gardens, waste spaces, on house walls, tree trunks and in wild areas across its native habitat.

It is labeled as an invasive species in a number of areas where it has been introduced, particularly Washington, where it is labeled as a noxious weed, many parts of the eastern United States, and Oregon, where its sale or cultivation are banned.