The Mexican woodnymph (Eupherusa ridgwayi) is a species of hummingbird in the family Trochilidae endemic to western Mexico.

A molecular phylogenetic study published in 2014 found that Thalurania was non-monophyletic and that the Mexican woodnymph is closely related to species in the genus Eupherusa.

[5] Mexican woodnymphs live exclusively in the northern mountains of western Mexico, with habitat in the states of Nayarit, Jalisco and Colima.

[5] Although there is little known of the specific habitat requirements for Mexican woodnymphs, we are aware that they reside in humid forests, canyons and foothills at elevations of 250–1200 meters.

[9] As evident from their restricted range, they are dependent on the forest health of western Mexico, where deforestation is threatening the habitat.