The Checklist of New Mexico Bird Species lists all the species of birds that have been verified by specimen, photograph, or audio recording in New Mexico and that have been accepted as valid by the New Mexico Bird Records Committee. Nomenclature, taxonomy, sequence, and spelling follow the seventh edition of the American Ornithologists’ Union’s Check-list of North American Birds (1998) as amended through its 61st Supplement (Auk, Vol. 137, 2020). Treated are all families and species of birds known to occur (or have occurred) in New Mexico in the historic (1540 to present) period. Through 1 January 2021, 549 species have been verified in New Mexico, including five established non-native species (identified as “Introduced”) and three species now extirpated (identified as “Extirpated”).