Slaty monarch

{{Short description|Species of bird}}

{{For|an alternate name of the Moluccan flycatcher|Myiagra galeata}}

{{speciesbox

| name = Slaty monarch

| image = Slaty Monarch.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=BirdLife International |date=2016 |title=Mayrornis lessoni |volume=2016 |page=e.T22707204A94110864 |doi=10.2305/IUCN.UK.2016-3.RLTS.T22707204A94110864.en |access-date=13 November 2021}}

| genus = Mayrornis

| species = lessoni

| authority = (G.R. Gray, 1846)

| subdivision_ranks = Subspecies

| subdivision = See text

| synonyms = * Rhipidura Lessoni

}}

The slaty monarch (Mayrornis lessoni) is a species of bird in the family Monarchidae endemic to Fiji. Its natural habitat is subtropical or tropical moist lowland forests.