Caliagrion is a monotypic genus of damselflies belonging to the family Coenagrionidae. The single species of this genus, Caliagrion billinghursti, is commonly known as a large riverdamsel, and is endemic to south-eastern Australia, where it inhabits slow-flowing rivers and ponds.

Caliagrion billinghursti is a large damselfly; the male is coloured bright blue with black, while the female is yellow and black.

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