天蓝苜蓿（学名：Medicago lupulina）为豆科苜蓿属下的一个种。

Medicago lupulina, commonly known as black medick, nonesuch, or hop clover, is a familiar lawn plant belonging to the legume or clover family. Plants of the genus Medicago, or bur clovers, are closely related to the true clovers (Trifolium) and sweet clover (Melilotus). Like the true clovers, black medick has three leaflets and a small, yellow flower closely resembling those of the lesser trefoil. Black medick belongs to the same genus as alfalfa.