The violet-capped woodnymph (Thalurania glaucopis) is a species of hummingbird in the family Trochilidae. It is found in forest (primarily humid), dense woodland, gardens and parks in south-eastern Brazil, eastern Paraguay, Uruguay, and far north-eastern Argentina (primarily Misiones Province). It is widespread and generally common, and therefore considered to be of Least Concern by BirdLife International (and consequently the IUCN).