常春藤（学名：Hedera helix），又名洋常春藤、长春藤、土鼓藤、木茑、百角蜈蚣，是常春藤属下的一种常绿攀援植物，在很多地区常春藤实际都属于入侵物种。

常春藤的种加词helix来自古希腊语，意思是“扭”。

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.