| M Obenaus (Leipzig) | V259 |
| S Oberdorf-Maass (Boulder, US) | P683 |
| M Oberhoffer (München) | V1402 |
| S Oberle (Halle/Saale) | P439 |
| W Ockenfels (Trier) | H466 |
| M Oeff (Brandenburg) | V851 |
| A Öffner (Essen) | P84 |
| M Oelze (Hamburg) | P366, P372, P444, P447 |
| C Özcelik (Berlin) | P422, V1106 |
| C Özcelik (Berlin) | P423, P426, P432 |
| D Ogi (Sunnyvale, US) | P886 |
| A Oksche (Berlin) | V1436 |
| H Olschewski (Gießen) | S1351 |
| M Olschewski (Freiburg) | P199, P689 |
| G Oltmanns (Sömmerda) | V266 |
| H Omran (Bonn) | P886 |
| H Omran (Bonn) | P125, P406, V249, V847 |
| J Onnasch (Leipzig) | V23 |
| J Opalka (Halle/Saale) | P1193 |
| CF Opitz (Berlin) | V827 |
| Chr Opitz (Berlin) | V829 |
| Chr Opitz (Münster) | P614 |
| H Oral (Ann Arbor, US) | P663 |
| M Orban (Essen) | V832 |
| JR Ortlepp (Aachen) | P1184 |
| H-D Orzechowski (Berlin) | V1436 |
| H-D Orzechowski (Berlin) | V728 |
| J Osende (New York, US) | P134 |
| K-J Osterziel (Berlin) | V17 |
| KJ Osterziel (Berlin) | P422, S1003, V1106 |
| KJ Osterziel (Berlin) | P423, P426, P432, V1252, V1298, V18 |
| I Ott (München) | P113, P127, P383, V30, V754 |
| R Otte (Herne) | P713, P714 |
| F Otto (Düsseldorf) | V552 |
| F Ouyang (Hamburg) | P1228, P1238, P893, P898, P911, V1111, V1306, V275 |
| S Ovroutski (Berlin) | V1428, V1431 |
| M Ozaydin (Ann Arbor, US) | P663 |