This is a list of the bird species recorded in Tonga. The avifauna of Tonga include a total of 88 species, of which two are endemic and five have been introduced by humans. 10 species are globally threatened.
This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) follow the conventions of The Clements Checklist of Birds of the World, 2022 edition. The family accounts at the beginning of each heading reflect this taxonomy, as do the species counts found in each family account. Introduced and accidental species are included in the total counts for Tonga.
The following tags have been used to highlight several categories. The commonly occurring native species do not fall into any of these categories.
- (A) Accidental - a species that rarely or accidentally occurs in Tonga
- (Ex) Extinct - a species which no longer exists
- (E) Endemic - a species endemic to Tonga
- (I) Introduced - a species introduced to Tonga as a consequence, direct or indirect, of human actions