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Hummingbirds are small birds in the family Trochilidae in the order Apodiformes. Among all birds, male hummingbirds have the widest diversity of plumage color, particularly in blues, greens, and purples. Hummingbirds are the smallest mature birds, measuring 7.5–13 cm (3–5 in) in length. The smallest is the 5 cm (2.0 in) bee hummingbird, which weighs less than 2.0 g (0.07 oz), and the largest is the 23 cm (9.1 in) giant hummingbird, weighing 18–24 grams (0.63–0.85 oz). Noted for their long beaks, hummingbirds are specialized for feeding on flower nectar, but all species also consume small insects.

There are currently 366 extant species of hummingbirds recognised by the International Ornithologists' Union.

Conventions
Range maps are provided wherever possible; if a range map is not available, a description of the collective range of species in that genera is provided. Ranges are based on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species unless otherwise noted. All extinct genera or species listed alongside extant species went extinct after 1500 CE, and are indicated by a dagger symbol "†".

This list follows the taxonomic treatment (designation and order of species) and nomenclature (scientific and common names) of version 13.2 of the IOC World Bird List. Where the taxonomy proposed by the IOC World Bird List conflicts with the taxonomy followed by the IUCN or the 2023 edition of The Clements Checklist of Birds of the World, the disagreement is noted next to the species's common name (for nomenclatural disagreements) or scientific name (for taxonomic disagreements).

Classification
The International Ornithologists' Union (IOU) recognizes 366 species of hummingbirds in 113 genera. This list does not include hybrid species, extinct prehistoric species, or putative species not yet accepted by the IOU.

Family Trochilidae
 * Subfamily Florisuginae: two genera, four species
 * Subfamily Phaethornithinae: six genera, 37 species
 * Subfamily Polytminae: twelve genera, 29 species
 * Subfamily Lesbiinae
 * Tribe Heliantheini: 14 genera, 53 species
 * Tribe Lesbiini: 18 genera, 67 species
 * Subfamily Patagoninae: one genus and species
 * Subfamily Trochilinae
 * Tribe Lampornithini: seven genera, 18 species
 * Tribe Mellisugini: 16 genera, 37 species
 * Tribe Trochilini: 36 genera, 114 species