| Formica edax Forskål, 1775 |
| Formica fervens Drury, 1782 |
| Formica festinata Buckley, 1866 |
| Formica filiformis Fabricius, 1804 |
| Formica flammiventris Wheeler, 1912 |
| Formica flavipes Geoffroy, 1785 |
| Formica foetida Linnaeus, 1758 |
| 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 |