Parapoynx stagnalis, the rice case bearer or rice caseworm, is a species of moth in the Crambidae family. It has a wide distribution and is found in South-East Asia, South Africa, South America, southern Europe (Spain and Greece), Russia and Australia (the Northern Territory and Queensland).

The wingspan is about 20 mm. The wings are semi-transparent, with faint brown zig-zag lines. There are two black comma-shaped marks on each forewing.

The larvae feed on Oryza sativa. Young larvae cause linear grazing. Later, portions of the leaf are cut off and used to make a portable case.