苦荞麦（学名：Fagopyrum tataricum）为蓼科荞麦属下的一个种。

Fagopyrum tataricum, also known as Tartary buckwheat, duckwheat, India buckwheat, India wheat, green buckwheat, ku qiao, or bitter buckwheat, is a domesticated food plant in the genus Fagopyrum in the family Polygonaceae. With another species in the same genus, common buckwheat, it is often counted as a cereal, but unlike the true cereals the buckwheats are not members of the grass family. Thus they are not related to true wheat. Tartary buckwheat is bitterer, but contains more rutin than common buckwheat. It also contains quercitrin.