浮萍属（学名：Lemna）又名青萍属，是泽泻目天南星科浮萍亚科下的一个属，为浮水小植物。该属约有13种，分布于全球。

Lemna is a genus of free-floating aquatic plants from the duckweed family. These rapidly growing plants have found uses as a model system for studies in community ecology, basic plant biology, ecotoxicology, and production of biopharmaceuticals, and as a source of animal feeds for agriculture and aquaculture. Currently, 14 species of Lemna are recognised.