The Yellow-rumped Mannikin (Lonchura flaviprymna) also known as the Yellow-rumped Munia, is a species of estrildid finch found in the eastern Kimberley region and north-west Northern Territory, Australia. It has an estimated global extent of occurrence of 20,000 to 50,000 km². It is found in subtropical to tropical mangrove, moist savanna and wetland habitats. The conservation status of the species is evaluated as being of Least Concern.