All the described butterfly and moth (Lepidoptera) species that are known to occur in Canada, Greenland, and the continental United States of America are listed. We have endeavored to include information from all publications up to the end of December 2022, as well as from a few publications that were in press at that time. All valid scientific names, from order to subspecies, are presented following the most recent available classification. For all species-level names, the current genus, species name, author, date, and original genus are listed. All available (and many unavailable) synonyms are listed, as well as hundreds of misspellings, emendations, misidentifications, and misapplied names published in the past century. In total, over 36,700 taxon names are included in the list.