| Navicula taraxa M.H. Hohn & Hellerman, 1966 |
| Navicula tenella Bréb., 1849 |
| Navicula tenera Hust., 1937 |
| Navicula towutiensis Cholnoky, 1963 |
| Navicula treyelyana Donkin, 1861 |
| Navicula triplex Van Land, 1975 |
| Navicula tripunctata (O.F. Müll.) Bory, 1827 |
| Navicula triundulata Grunow, 1867 |
| Navicula tumida Bréb. ex Kütz., 1849 |
| Navicula turgida Ehrenb., 1830 |
| Navicula umbonata Ehrenb., 1838 |
| Navicula vacillans A. Schmidt, 1875 |
| Navicula variostriata Krasske, 1923 |
| Navicula veneta Kütz., 1844 |
| Navicula ventricosa Ehrenb., 1839 |
| Navicula vidovichii Grunow, 1863 |
| Navicula vimineoides Giffen, 1975 |
| Navicula viridula (Kütz.) Ehrenb., 1836 |
| Navicula viridula var. rostellata (Kütz.) Cleve, 1895 |
| Navicula viridula var. viridula (Kütz.) Ehrenb., 1836 |