Austroargiolestes elke is a species of Australian damselfly in the family Argiolestidae, commonly known as an azure flatwing. It is endemic to the vicinity of Eungella National Park in north-central Queensland, where it inhabits streams in rainforests.
Austroargiolestes elke is a medium-sized to large, black and blue damselfly, with strong pruinescence on adult bodies. Like other members of the family Argiolestidae, it rests with its wings outspread.