The Flores monarch (Symposiachrus sacerdotum), is a species of monarch flycatcher in the Monarchidae family. It is endemic to the western half of the island of Flores in Indonesia. Its natural habitat is subtropical or tropical moist lowland forests between 350m and 1,000m in altitude. The Flores monarch has an estimated population of about 2,500-9,999 individuals, but its numbers are presumed to be decreasing. It is threatened by habitat loss and habitat fragmentation.