Rhyothemis triangularis (sapphire flutterer, lesser blue wing) is a species of dragonfly in the family Libellulidae. It is widespread in eastern and southern Asia.
It is a small blue colored dragonfly with bases of all wings have dark metallic blue patches. This species breeds in well vegetated ponds and similar habitats. From karyotyping it is known to have 13 chromosomes.
