Mesagrion leucorrhinum

{{Short description|Species of damselfly}}

{{Use dmy dates|date=August 2022}}

{{Speciesbox

| image = Mesagrion leucorrhinum.jpg

| status = LC

| status_system = IUCN3.1

| genus = Mesagrion

| parent_authority = Selys, 1885

| species = leucorrhinum

| authority = Selys, 1885

| display_parents = 3

| status_ref = {{cite iucn |author=Bota-Sierra, C. |author2=Palacino, F. |author3=Rache, L. |author4=Ellenrieder, N. |author5=Paulson, D. |date=2016 |title=Mesagrion leucorrhinum |volume=2016 |page=e.T60294A66887433 |doi=10.2305/IUCN.UK.2016-1.RLTS.T60294A66887433.en}}

}}

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.Seth M. Bybee et al. (2021) Phylogeny and classification of Odonata using targeted genomics. Molecular Phylogenetics and Evolution 160: 1-15

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