扁芒草属（学名：Danthonia）是禾本科下的一个属，为多年生丛生草本植物。该属共有约100种，分布于两半球的温带地区。

Danthonia is a genus of Eurasian, North African, and American plants in the grass family. Members of this genus are sometimes referred to as oatgrass, but that common name is not restricted to this genus. Other common names include heathgrass and wallaby grass.