| R. Oberheiden (Oberhausen) | P541 |
| M. Obst (Berlin) | P534 |
| H. Ocholla (Frankfurt am Main) | V1477 |
| V. Ochsenhirt (Mainz) | V678 |
| K. Odening (Freiburg im Breisgau) | P1244, V1798 |
| M. Oelze (Mainz) | P137, P146, P150, V676, V677, V1156, P1218, P1286, P1288, P1289, V1476 |
| E.-M. Oenning (Lübeck) | P1541, V1791 |
| E. Oepangat (Bad Oeynhausen) | P226, V337 |
| U. Oetjen (Frankfurt) | P933, V1876 |
| H. Oettle (Berlin) | P1499 |
| F. Oezaslan (Frankfurt) | P1601 |
| N. Ogurek (Bad Nauheim) | P125 |
| M. Ohlow (Bad Berka) | P187, P508, P1261, P1496 |
| M. Okumura (Tochigi, JP) | P1594 |
| O. Oldenburg (Bad Oeynhausen) | P226, V337, P1281 |
| A. Oliva (Utica, US) | P541 |
| S. Olofsson (Uppsala, SE) | V1787, V1788 |
| H. Olschewski (Graz, AT) | V360, AG1949 |
| M. Olschewski (Freiburg) | P251, V1436 |
| K. von Olshausen (Hamburg) | P171 |
| E. N. Olson (Dallas, TX, US) | V1466 |
| T. Olson (München) | V1823 |
| C. Oltenau (Bad Nauheim) | P1191 |
| F. Oltmanns (Göttingen) | P555 |
| P. Ong (Stuttgart) | P926, P1559 |
| A. Opitz (Traunstein) | V1458 |
| C. Opitz (Berlin) | AG1949 |
| S. Oppermann (Hamburg) | P171 |
| C. Orhan (Giessen) | P1595 |
| J. Ortak (Lübeck) | V40, V78, V110, V322, P527, P586, P948 |
| M. Ortak (Hamburg) | P234, P871, V1917 |
| J.R. Ortlepp (Aachen) | AG800 |
| H.-D. Orzechowski (Berlin) | P1163, V1428 |
| S. Osche (Berlin) | P905, P908 |
| N. Osman (Baltimore, US) | V667 |
| B. Osswald (Heidelberg) | P1492 |
| M.A. Ostad (Mainz) | V677, V1057 |
| H.-H. Osterhues (Lörrach) | AG1786 |
| S. Ostermayer (Frankfurt) | V1043 |
| A. Osterspey (Köln) | zHS625 |
| H. Oswald (Hannover) | V76 |
| T. Ota (Kawasaki-City, JP) | P1594 |
| A. Otto (Bad Segeberg) | P184 |
| S. Oustanina (Bad Nauheim) | V1082 |
| F. Ouyang (Hamburg) | P202, P1569, P1587, V1828 |
| N. Oversohl (München) | V775 |
| M. Ovize (Lyon, FR) | zHS305 |