| Časopis | Izdavač | Grad |
| Ocean and polar research | Korea Ocean Research and Development Institute | Seoul |
| Ocean dynamics | Springer Verlag | Berlin |
| Ocean research | Korea Ocean Research and Development Institute | Seoul |
| Ocean science journal | Korea Ocean Research & Development Institute | Ansann |
| Oceanic abstract | Cambridge Scientific Abstracts | Louisville |
|
Oceanologia quarterly journal of basic research in marine sciences with emphasis |
Polish Academy of Sciences,Institute of Oceanology | Sopot |
| Oceanologica acta | Gauthier-Villars | Paris |
| Oceanological and hydrobiological studies | Institute of Oceanography University of Gdansk | Gdansk |
| Oceanological studies | Polish Academy of Sciences | Gdansk |
|
Oceanus reports on research from the Woods Hole Oceanographic Institution |
Woods Hole Oceanographic Institution | Woods Hole |
| Oceologia aquatica | Universidad de Barcelona departamento ecologia | Barcelona |
|
Oebalia international journal of marine biology and oceanography |
Istituto Sperimentale Talassografico "A. Cerruti" | Taranto |
| Oil and chemical pollution | Elsevier Science Publishers Ltd | Essex |
| Okolis | Drzavna uprava za zastitu okolisa | Zagreb |
| Ophelia | Marine Biological Laboratory | Helsinki |
| Osjecki zbornik | Muzej Slavonije Osijek | Osijek |
| Otvoreno more | Slobodna Dalmacija | Split |