| Pheidole nasutoides Hölldobler & Wilson, 1992 |
| Pheidole nebulosa Wilson, 2003 |
| Pheidole nevadensis Forel, 1901 |
| Pheidole nitidicollis Emery, 1896 |
| Pheidole nubicola Wilson, 2003 |
| Pheidole nuculiceps Wheeler, 1908 |
| Pheidole oaxacana Wilson, 2003 |
| Pheidole obscurior Forel, 1886 |
| Pheidole obturaculum Longino, 2019 |
| Pheidole obtusospinosa Pergande, 1896 |
| Pheidole opaca subsp. apterostigmoides Weber, 1943 |
| Pheidole opaca subsp. sarrita Forel, 1908 |
| Pheidole opaca var. incrustata Forel, 1908 |
| Pheidole optiva Forel, 1901 |
| Pheidole oregonica Emery, 1895 |
| Pheidole pacifica Wheeler, 1915 |
| Pheidole pallidula (Nylander, 1849) |
| Pheidole partita Mayr, 1887 |
| Pheidole pennsylvanica Roger, 1863 |
| Pheidole perdiligens Wilson, 2003 |