Black-naped monarch
 or black-naped blue flycatcher (Dớp ruồi xanh gáy đen, Hypothymis azurea)

The black-naped monarch or black-naped blue flycatcher (Hypothymis azurea) is a slim and agile passerine bird belonging to the family of monarch flycatchers found in southern and south-eastern Asia. 

The black-naped monarch breeds across tropical southern Asia from Iran and Sri Lanka east to Indonesia and the Philippines. In Vietnam, the bird is found at the Cat Tien National Park.

The word Hypothymis is from the Ancient Greek hupothumis, the name of an unidentified bird mentioned by the playwright Aristophanes.
 The specific epithet azurea is from the Medieval Latin azureus meaning "azure-coloured" or "azure-blue".