| Formica foreliana Wheeler, 1913 |
| Formica francoeuri Bolton, 1995 |
| Formica fungosa Fabricius, 1798 |
| Formica fusca Linnaeus, 1758 |
| Formica fusca subsp. blanda Wheeler, 1913 |
| Formica fusca subsp. pallipes Kuznetsov-Ugamsky, 1926 |
| Formica fusca var. algida Wheeler, 1915 |
| Formica fusca var. argentea Wheeler, 1912 |
| Formica fusca var. densiventris Viereck, 1903 |
| Formica fusca var. gelida Wheeler, 1913 |
| Formica fusca var. neoclara Emery, 1893 |
| Formica fusca var. neorufibarbis Emery, 1893 |
| Formica fusca var. rufipes Stitz, 1930 |
| Formica fusca var. subpolita Mayr, 1886 |
| Formica glebaria Nylander, 1846 |
| Formica gnava Buckley, 1866 |
| Formica gracilescens Nylander, 1856 |
| Formica gracilipes Smith, 1857 |
| Formica gracilis Fabricius, 1804 |
| Formica grossa Fabricius, 1787 |