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Dasornis
"Neptuniavis"''redirects here. For "N." minor, see '' Odontopteryx.

Dasornis is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.

Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey ( England). The exception are a few approximately 45 Ma-old remains from the Lutetian ( Middle Eocene, MP11-13) of Etterbeek ( Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).