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Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Polypodiopsida /
 Pteridopsida (disputed)
Order: Salviniales
Family: Marsileaceae
Genus: Regnellidium

Regnellidium diphyllum Lindm.
Regnellidium upatoiensis

Regnellidium is a monotypic genus of ferns of family Marsileaceae.

The single living species, Regnellidium diphyllum, Two-leaf Water Fern, is native to South Eastern Brazil and adjacent regions of Argentina. It resembles its relatives from the genus Marsilea, but has 2-lobed leaves (rather than 4). This fern is sometimes grown in aquaria. It is the only non-flowering plant that produces latex.

A fossil assigned to the species Regnellidium upatoiensis has been found in Cretaceous deposits of the eastern United States.