| Navicula patrickae Hust., 1955 |
| Navicula pavillardii Hust., 1939 |
| Navicula pelagi A. Schmidt, 1875 |
| Navicula pelagica Cleve, 1896 |
| Navicula pelliculosa Bréb. ex Kütz., 1863 |
| Navicula pennata A. Schmidt, 1876 |
| Navicula peregrina (Ehrenb.) Kütz., 1844 |
| Navicula permagna (Bailey) A.M. Edwards, 1859 |
| Navicula perminuta Grunow, 1880 |
| Navicula peticolasii M. Perag, 1909 |
| Navicula placenta Ehrenb., 1854 |
| Navicula platyventris F. Meister, 1935 |
| Navicula praestes A. Schmidt, 1875 |
| Navicula probabilis A. Schmidt, 1877 |
| Navicula protracta Grunow, 1880 |
| Navicula pseudobacillum Grunow, 1880 |
| Navicula pseudocrassirostris Hust., 1961 |
| Navicula pseudogracilis Hust., 1927 |
| Navicula pseudotuscula Hust., 1943 |
| Navicula pullus Hust., 1955 |