Parapoynx polydectalis is a moth in the family Crambidae.

It is found in Indonesia (including Sumatra), New Guinea and Australia, where it has been recorded from Queensland,[1] northern Western Australia, the Northern Territory, New South Wales and Victoria.

[2] It is an introduced species in Great Britain and France.

There is a pattern of brown and white on the wings.

The larvae are aquatic, feeding on water weeds.