膜稃草属（学名：Hymenachne）是禾本科下的一个属，为水生或近水生草本植物。该属共有10种以上，分布于东半球温带地区。

Hymenachne is a genus of widespread wetlands plants in the grass family. They may be known commonly as marsh grasses. They are distributed in tropical and subtropical regions of Asia, the Americas, and the Pacific Islands. A species from the Americas, H. amplexicaulis, is well known in other parts of the world as an introduced and invasive species.