| Navicula gracilis var. radiosa (Kütz.) Rabenh., 1847 |
| Navicula graeffii Grunow, 1875 |
| Navicula granulata Bailey, 1854 |
| Navicula granulata Ehrenb., 1836 |
| Navicula gregaria Donkin, 1861 |
| Navicula gregaria var. thurholmensis (J. -Danff.) Cleve, 1894 |
| Navicula grevilleana Hendey, 1964 |
| Navicula grevilleoides Hust., 1962 |
| Navicula grimmei Krasske, 1930 |
| Navicula gruendleri (Cleve & Grunow) Cleve, 1895 |
| Navicula hagelsteinii Hust., 1962 |
| Navicula halophila (Grunow) Cleve, 1894 |
| Navicula halophilioides Hust., 1959 |
| Navicula hambergii Hust., 1924 |
| Navicula hanseni H. Möller, 1950 |
| Navicula hustedtii Krasske, 1923 |
| Navicula hyalina Donk., 1861 |
| Navicula impressa Grunow, 1875 |
| Navicula inaequalis Ehrenb., 1836 |
| Navicula incerta Grunow ex Van Heurck, 1885 |