Austroagrion cyane, the south-western billabongfly,[3] is a species of damselfly of the family Coenagrionidae.

[5] Austroagrion cyane are permanent residents of aquatic habitats.

They prefer slow-moving water.

The species grows to around 2–3 cm in length.

Females are less common than males and are mostly attracted to ephemeral swamps.