Eofringillirostrum is an extinct species of bird known from the Early Eocene Green River Formation of the Western United States and from the Messel Pit in Germany.

It was found in the "sandwich beds" of the Fossil Butte Member of the Green River Formation, near Kemmerer, Wyoming, United States.

In 2019, Ksepka, Mayr, and Grande described both species as members of the Psittacopedidae, noting that they were the first birds with finch-like beaks in the fossil record.

†Morsoravis sedilis †Pumiliornis tesselatus †Eofringillirostrum parvulum †Eofringillirostrum boudreauxi †Zygodactylidae Passeriformes A subsequent analysis, published in Mayr (2020),[2] did not support the positioning of Eofringillirostrum as a psittacopedid and rather placed it as the sister taxon to a clade of Psittacopedidae, Halcyornithidae, and Messelasturidae.

Mayr & Kitchener (2022) noted that although there are differences between Eofringillirostrum and unambiguous psittacopedids in foot anatomy, this could be a result of specialised ecology, rather than from a distant relationship.

[1] The last common ancestor of the songbirds is not thought to have consumed seeds, indicating that this ecological niche was filled by different adaptive radiations in the Cenozoic.

The anisodactyl passerines construct much more varied nests and do not depend on such cavities, and, as such, could have outcompeted other birds with similar feeding specialisations.