Mesagrion leucorrhinum

Mesagrion leucorrhinum is a species of damselfly. Its monotypic genus Mesagrion was formerly in the subfamily Argiolestinae of the flatwing damselfly family (Megapodagrionidae). As a result of molecular phylogenetic studies by Bybee et al. in 2021, it is now in its own family, Mesagrionidae.

Mesagrion leucorrhinum is endemic to Colombia. Its natural habitats are subtropical or tropical moist montane forests and rivers. It is threatened by habitat loss.