| Inga Obenhaus (Hamburg) | P957 |
| Ludger Obergassel (Bielefeld) | V523, V524 |
| Martin Oberhoff (Bristol, GB) | P642, V797 |
| Natalie Obermeyer (Hamburg) | P168 |
| Michael Obst (Berlin) | V1080 |
| Darius Oczkowicz (Sankt Augustin) | P952 |
| Simone Odau (Berlin) | P661 |
| Alexandra Öffner (Essen) | P176 |
| Hellmut Oelert (Mainz) | P664 |
| Matthias Oelze (Hamburg) | P960, P961, P965, V224, V542 |
| Niels Oesingmann (Erlangen) | P980, V893 |
| Michaela Östringer (Heidelberg) | P1202 |
| Cemil Özcelik (Berlin) | P1204, V1090 |
| Olaf Oldenburg (Mobile, US) | V481 |
| Henrike Ollmann (Berlin) | P1210 |
| Isabel Ollmann (Hamburg) | V539 |
| Horst Olschewski (Gießen) | I322 |
| Eric Olson (Dallas, US) | V7 |
| Gerhard Oltmanns (Sömmerda) | V1367 |
| Heyder Omran (Bonn) | I1057, I301, P941, P979, V1137, V1390, V258, V516, V519 |
| K Ookubo (Tokio, JP) | P94 |
| Christian Opitz (Berlin) | V590 |
| Dagmar Oppermann (Hannover) | V205 |
| Kristina Orth-Gomer (Stockholm, SE) | H217 |
| Jan Ortlepp (Aachen) | P381, V870 |
| Jan Ortlepp (Aachen) | P1232, P1233, P368 |
| Magda Ortmann (Hannover) | V806 |
| Brigitte Osswald (Heidelberg) | P1000 |
| Brigitte Osswald (Heidelberg) | P1187 |
| Stefan Ostermayer (Frankfurt/Main) | P1001, P1006, P933, V256, V519 |
| Karl-Josef Osterziel (Berlin) | P1204, P402, V1090, V1100 |
| Karl-Josef Osterziel (Berlin) | A1470, A1490 |
| Ralf Otte (Herne) | P635, P636 |
| Alexander Ottenhof (Münster) | V788 |
| Feifan Ouyang (Hamburg) | P187, P457, V1117, V778 |
| Fifan Ouyang (Hamburg) | P465 |
| Stanislav Ovroutski (Berlin) | V1487 |