| J. Obergassel (Hamburg) | P443 |
| M. Oberhoffer (Mainz) | V839 |
| B. M. Quesada Ocete (Mainz) | P154 |
| K. Odening (Bern, CH) | V942 |
| J. Oesterschlink (Bad Oeynhausen) | P159 |
| V. Oettinger (Freiburg im Breisgau) | P96 |
| J. Oetvoes (Berlin) | P435 |
| S. Offermanns (Bad Nauheim) | BS950 |
| M. Olesen (Copenhagen) | P767 |
| C. Olivier (Freiburg im Breisgau) | V503 |
| C. Omoregie (Ulm) | P429 |
| P. Ong (Stuttgart) | P505, P675, P958 |
| L. Orlean (Freiburg) | BS652 |
| E. Orthey (Hamburg) | BS902 |
| S. Orwat (Münster) | P963 |
| B. Osswald (Duisburg) | P320 |
| I. Ott (Pforzheim) | P507 |
| S. Ott (Berlin) | P83 |
| M. Otto (Ulm) | P692 |
| S. Otto (Jena) | P333, P506 |
| M. Oudeh (Coburg) | P510, P961 |
| F. Ouyang (Hamburg) | P74, P157, P170, P433, P443, P768, P908, P910 |