Limnonectes khasianus, commonly known as the corrugated frog, rivulet frog, or sometimes (ambiguously) called "flat-headed frog", is a species of frog in the family Dicroglossidae. It is found in Brunei, India, Indonesia, Malaysia, Myanmar, Thailand, and also in India, Bangladesh and possibly in Bhutan. Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, rivers, intermittent rivers, freshwater marshes, and intermittent freshwater marshes. It is not considered threatened by the IUCN.

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