The yellow warbler (Setophaga petechia) is a New World warbler species. Yellow warblers are the most widespread species in the diverse genus Setophaga. The species can be found throughout most of North America and migrates to wintering grounds from southern California to the Amazon region, Bolivia, and Peru.

The yellow warbler is a small bird with 35 subspecies, known for its yellow and greenish-golden plumage. They inhabit riparian or moist lands with small trees, mangrove swamps, and dense woody growth. Yellow warblers have a varied diet, primarily consisting of caterpillars and other insects. They are monogamous, with breeding pairs sharing parental responsibilities. The species is not considered threatened by the IUCN, but localized declines have been observed due to habitat destruction and pollution. The North American populations are legally protected under the Migratory Bird Treaty Act.