| First Name | Last Name | Institutions | Articles |
|---|---|---|---|
| María Dolores | Oliver-Alfonso | University of Seville | 1 |
| Michael | Oates | Integrated Environmental Solutions Ltd | 1 |
| Mária | Osvaldová | Technical University in Zvolen | 1 |
| Małgorzata | Okręglicka | Częstochowa University of Technology | 1 |
| Matvey | Oborin | Lomonosov Moscow State University | 1 |
| Mária | Oleárová | University of Prešov | 2 |
| Marian | Oliński | University of Warmia and Mazury in Olsztyn | 2 |
| Mihály | Ormos | Eötvös Loránd University; J. Selye University |
3 |