| 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 |
| Formica trifasciata Smith, 1858 |
| Formica tristis Christ, 1791 |
| Formica truncicola Nylander, 1846 |
| Formica truncicola subsp. integroides Wheeler, 1913 |
| Formica tuberculata Olivier, 1792 |
| Formica umbrata Nylander, 1846 |
| Formica vagans Olivier, 1792 |