Asplenium flaccidum is a species of fern in the family Aspleniaceae.

The plant common name is drooping spleenwort or weeping spleenwort, and the species name flaccidum derives from the Latin root meaning drooping.

[1] An example occurrence of A. flaccidum is within a Nothofagus-Podocarp forest at Hamilton Ecological District on New Zealand's North Island in association with other fern species understory plants, crown fern, Blechnum discolor being an example.

[2] A global phylogeny of Asplenium published in 2020 divided the genus into eleven clades,[3] which were given informal names pending further taxonomic study.

A. flaccidum belongs to the "Neottopteris clade", members of which generally have somewhat leathery leaf tissue.