All species and subspecies of beetles known to occur in Canada and Alaska are listed along with their synonyms; these names are arranged alphabetically under the respective genus-group names. Valid genus-group and family-group names are listed in phylogenetic order. No new taxa, combinations, or synonyms are proposed. Species distributions are presented in tabular form, indicating the presence or absence of the taxa in each province and territory, in Labrador, and in Alaska. Introduced and holarctic species are highlighted. References to pertinent identification keys are indicated under the corresponding supraspecific taxon. The work also includes a brief introduction for every family treated and an index to all supraspecific names.