The Frill-necked Monarch (Arses lorealis) is a species of bird in the Monarchidae family. It is endemic to Australia. It was considered a subspecies of the related Frilled Monarch (Arses telescophthalmus) for many years before being reclassified as a separate species in 1999 by Schodde and Mason and upheald by Christidis and Boles in 2008.

Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montanes.