Menyanthaceae is a family of aquatic and wetland plants in the order Asterales.

The simple or compound leaves arise alternately from a creeping rhizome.

In the submersed aquatic genus Nymphoides, leaves are floating and support a lax, umbellate or racemose inflorescence.

Menyanthaceae species are of economic importance as ornamental water garden plants, with Nymphoides being most commonly traded.

The practice of growing non-native water plants has led to several species becoming naturalized or invasive.