| Nitzschia granulata Grunow, 1880 |
| Nitzschia grossestriata Hust., 1955 |
| Nitzschia gruendleri Grunow, 1878 |
| Nitzschia grunowii Hasle, 1972 |
| Nitzschia habirshawii Febiger ex Cleve & Möller, 1879 |
| Nitzschia hantzschiana Rabenh., 1860 |
| Nitzschia holsatica Hust., 1924 |
| Nitzschia homburgiensis Lange-Bert., 1978 |
| Nitzschia hungarica Grunow, 1862 |
| Nitzschia hustedtiana Salah, 1953 |
| Nitzschia hybrida Grunow, 1880 |
| Nitzschia inconspicua Grunow, 1862 |
| Nitzschia inflatula Hasle, 1965 |
| Nitzschia insignis W. Greg., 1857 |
| Nitzschia insignis var. adriatica Grunow |
| Nitzschia insignis var. spathulifera Grunow, 1889 |
| Nitzschia intermedia Hantzsch ex Cleve & Grunow, 1880 |
| Nitzschia interruptestriata Hassall, 1845 |
| Nitzschia kolaczekii Grunow, 1867 |
| Nitzschia laevis Hust., 1939 |