The black-and-white warbler (Mniotilta varia) is a species of New World warbler, the only member of its genus, Mniotilta. The genus name is from Ancient Greek mnion, "seaweed", and tillo, "to pluck"; Vieillot mistranslated the first word as "moss". The specific varia is from Latin varius, "variegated". It breeds in northern and eastern North America from the Northwest Territory and Newfoundland and Labrador, Canada to Florida. This species is migratory, wintering in Florida, Central America and the West Indies down to Peru. This species is a very rare vagrant to western Europe.