| Navicula hagelsteinii Hust., 1962 |
| Navicula halophila (Grunow) Cleve, 1894 |
| Navicula halophilioides Hust., 1959 |
| Navicula hambergii Hust., 1924 |
| Navicula hanseni H. Möller, 1950 |
| Navicula heufleri Grunow, 1860 |
| Navicula hofmanniae Lange-Bert., 1993 |
| Navicula hustedtii Krasske, 1923 |
| Navicula hyalina Donk., 1861 |
| Navicula impexa Hust., 1961 |
| Navicula impressa Grunow, 1875 |
| Navicula inaequalis Ehrenb., 1836 |
| Navicula incarum U. Rumrich & Lange-Bert., 2000 |
| Navicula incerta Grunow ex Van Heurck, 1885 |
| Navicula incomposita Hagelst., 1939 |
| Navicula inflexa (Gregory) Ralfs, 1861 |
| Navicula intercedens A. Schmidt, 1890 |
| Navicula intermedia Lagerh., 1873 |
| Navicula interrupta (W. Sm.) A. Schmidt, 1876 |
| Navicula krammerae Lange-Bert., 1996 |