水蕨（学名：Ceratopteris thalictroides）为水蕨科水蕨属下的一个种。

The species Ceratopteris thalictroides is a fern species belonging to the genus Ceratopteris, one of only two genera of the Ceratopteridoideae subfamily of the family Pteridaceae. The species represents a special living form of ferns, and is thus of great botanical interest. The leaf and stem can also be used medically.