The blue seedeater (Amaurospiza concolor) is a species of bird in the family Cardinalidae. It was formerly placed with the American sparrows in the Emberizidae. It is found in highland forest and woodland, mainly near bamboo, in southern Mexico and Central America with a disjunct population in south-western Colombia, through Ecuador, to northern Peru. The population in south-western Mexico has a paler plumage than the other populations and has sometimes been considered a separate species, the slate-blue seedeater (A. relicta), but today all major authorities include this as a subspecies of the blue seedeater. Due to its association with bamboo, it is often local and erratic in occurrence, but overall it is not considered threatened and therefore listed as Least Concern by BirdLife International and IUCN.