| Navicula ammophila Grunow, 1882 |
| Navicula ammophila var. intermedia Grunow, 1862 |
| Navicula amphibola Cleve, 1891 |
| Navicula anceps (Ehrenb.) Mann, 1907 |
| Navicula angusta Grunow, 1860 |
| Navicula angustata W. Sm., 1853 |
| Navicula antillarum (Cleve & Grunow) Mann, 1907 |
| Navicula apiculata Bréb., 1854 |
| Navicula arenaria Donkin, 1861 |
| Navicula arvensis Hust., 1937 |
| Navicula auriculata Hust., 1944 |
| Navicula bacillum Ehrenb., 1839 |
| Navicula bifissa A. Schmidt, 1897 |
| Navicula bigemmata A. Mann, 1925 |
| Navicula bilobata Leud.-Fortm., 1879 |
| Navicula binodulosa M. Sullivan & Reimer, 1975 |
| Navicula brachium Hust., 1944 |
| Navicula brasiliensis Grunow, 1863 |
| Navicula brevissima Hust., 1937 |
| Navicula campylodiscus Grunow, 1875 |