狼杷草（学名：Bidens tripartita）别称鬼刺、鬼针，是菊科鬼针草属的植物。

狼杷草为一年生草本植物，高可达0.9米。茎直立，基部分枝，五毛；叶对生，中上部的叶通常3-5深裂，顶端的叶有时不分裂；秋季开黄色管状花，头状花序顶生，两性。扁平楔形瘦果，沿棱边具有硬毛。

Bidens tripartita is a common and widespread species of plants in the sunflower family, commonly known as Three-lobe Beggarticks, Three-part Beggarticks, Leafy-bracted Beggarticks or Trifid Bur-marigold. It is native to much of Eurasia, North Africa, and North America, with naturalized populations in Australia and on some Pacific Islands.