Griseargiolestes griseus is a species of Australian damselfly in the family Argiolestidae, commonly known as a grey flatwing. It is endemic to south-eastern New South Wales, where it inhabits bogs and seepages near small streams.
Griseargiolestes griseus is a medium-sized damselfly, black-green metallic in colour with pale markings. Adults can be strongly pruinescent on their body and tail. Like other members of the family Argiolestidae, it rests with its wings outspread.