拳参（学名：Polygonum bistorta）为蓼科蓼属下的一个种。

Persicaria bistorta (bistort, common bistort, or meadow bistort) is a species of flowering plant native to Europe and north and west Asia. The generic placement of this species is in flux. While treated here in Persicaria, it has also been placed in Polygonum or Bistorta.