白毛羊胡子草（学名：Eriophorum vaginatum）为莎草科羊胡子草属下的一个种。

Eriophorum vaginatum L. (hare's-tail cottongrass, tussock cottongrass, sheathed cottonsedge) is a species of perennial herbaceous plant in the family Cyperaceae, native to bogs and other acidic wetlands throughout the Holarctic Kingdom. It is a 30–60 cm high tussock-forming plant with erect solitary spikelets.