The moustached warbler (Acrocephalus melanopogon) is an Old World warbler in the genus Acrocephalus. It breeds in southern Europe and southern temperate Asia with a few breeding in north-west Africa. It is partially migratory. South-west European birds are resident, south-east European birds winter in the Mediterranean breeding range, and the Asiatic race migrates to Arabia, India and Pakistan. The sexes are identical, as with most warblers, but young birds are more heavily streaked and have markings on the breast. Like most warblers, it is insectivorous and also feeds on water snails.