Griseargiolestes metallicus is a species of Australian damselfly in the family Argiolestidae, commonly known as a metallic flatwing. It has only been recorded from rainforests in the vicinity of Tully Gorge National Park in northern Queensland, where it inhabits streams.
Griseargiolestes metallicus is a medium-sized damselfly, black-green metallic in colour with pale markings, without pruinescence. Like other members of the family Argiolestidae, it rests with its wings outspread.