The Wood-warblers or New World warblers (Parulidae) are a group of 131 species of small often colourful passerine birds restricted to the New World. They are not related to the Old World warblers or the Australian warblers.

Most are arboreal, but some, like the Ovenbird and the two waterthrushes, are more terrestrial. Most members of this family are insectivores. Many migratory species, particularly those breeding further north, have distinctive male plumage at least in the breeding season, since males need to reclaim territory and advertise for mates each year. This tendency is particularly marked in the large genus Dendroica. In contrast, resident tropical species, which pair for life, show little if any sexual dimorphism.

The scientific name for the family, Parulidae, originates from the fact that Linnaeus in 1758 named the Northern Parula as a tit, Parus americanus, and, as taxonomy developed, the genus name was modified first to Parulus and then the current Parula.