Masdevallia agaster

{{Short description|Species of orchid}}

{{Speciesbox

| image = Masdevallia agaster.jpg

| genus = Masdevallia

| display_parents = 3

| parent = Masdevallia subsect. Masdevallia

| species = agaster

| authority = Luer

}}

Masdevallia agaster is a species of epiphytic orchid endemic to southern Ecuador.