This is a list of the bird species recorded in Northern Ireland. The avifauna of Northern Ireland include a total of 371 species, of which 10 have been introduced by humans. This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (English and scientific names) are those of the International Ornithological Congress (IOC) as of July 2021. The following tags have been used to highlight several categories. The commonly occurring native species do not fall into any of these categories.