The Mussau flycatcher (Myiagra hebetior) is a species of bird in the family Monarchidae. It is endemic to Mussau Island in the Bismarck Archipelago.
Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.
The Mussau flycatcher is threatened by habitat loss due to logging and is considered Vulnerable by the IUCN.