Siamogale melilutra was an extinct species of giant otter. It is from the late Miocene epoch, from Yunnan province, China. The skull has a combination of otter-like and badger-like cranial features. The new species belongs to the Lutrinae subfamily. "Siamogale melilutra" was about the size of a wolf. It was estimated to about . This is two to three times larger than any modern otter species.