Diphlebia lestoides is a species of Australian damselfly in the family Lestoideidae, commonly known as a whitewater rockmaster. It is endemic to south-eastern Australia, where it inhabits streams and rivers.

Diphlebia lestoides is a large, solid-looking damselfly; the male is a blue to grey colour with black markings, while the female has a more muted colouring. It sits with its white marked wings spread out.

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