| Formica pulla Francoeur, 1973 |
| Formica rasilis Wheeler, 1903 |
| Formica rasilis subsp. spicata Creighton, 1950 |
| Formica retecta Francoeur, 1973 |
| Formica rufa Linnaeus, 1761 |
| Formica rufa subsp. subcaviceps Creighton, 1940 |
| Formica rufa subsp. subfasciata Creighton, 1940 |
| Formica sansabeana Buckley, 1866 |
| Formica senex Smith, 1858 |
| Formica sericeiventris Guérin-Meneville, 1838 |
| Formica sessilis Say, 1836 |
| Formica sexguttata Fabricius, 1793 |
| Formica striata Smith, 1862 |
| Formica subcyanea Wheeler, 1913 |
| Formica subpolita Mayr, 1886 |
| Formica subpolita var. camponoticeps Wheeler, 1913 |
| Formica subpolita var. ficticia Wheeler, 1913 |
| Formica sylvatica Olivier, 1792 |
| Formica terricola Buckley, 1866 |
| Formica tridentata Fabricius, 1804 |