| Navicula pupula Kütz., 1844 |
| Navicula pygmaea Kütz., 1849 |
| Navicula quarnerensoides Hust., 1961 |
| Navicula radiosa Kütz., 1844 |
| Navicula radiosa var. radiosa Kütz., 1844 |
| Navicula radiosa var. tenella (Bréb.) Van Heurck, 1885 |
| Navicula radiostriata Hust., 1936 |
| Navicula recens (Lange-Bert.) Lange-Bert., 1985 |
| Navicula regularis Hust., 1955 |
| Navicula retusa Bréb., 1854 |
| Navicula rhynchocephala Kütz., 1844 |
| Navicula rhynchocephala var. constricta Huds., 1954 |
| Navicula rhynchocephala var. rhynchocephala Kütz., 1844 |
| Navicula rostellata Kütz., 1844 |
| Navicula rostellata var. minor (Grunow) Cleve-Euler, 1953 |
| Navicula ruttneri Hustedt, 1936 |
| Navicula salinarum Grunow, 1880 |
| Navicula salinarum var. intermedia (Grunow) Cleve, 1895 |
| Navicula salinarum var. salinarum Grunow, 1880 |
| Navicula salinicola Hust., 1939 |