| Alexander Jabs (Atlanta, US) | P977 |
| Howard Jacob (Milwaukee, US) | V221 |
| Matthias Jacob (München) | P682, P683 |
| Michael Jacob (Berlin) | H814 |
| Peter Jacob (Würzburg) | P1281 |
| Johannes Jacobi (Stanford, US) | P156 |
| Stefan Jacobs (Leipzig) | P734 |
| Wilfried Jacobs (Düsseldorf) | I300 |
| Claudius Jacobshagen (Göttingen) | P1313, V895 |
| Peter de Jaegere (Rotterdam, NL) | V1477 |
| Farouc Jaffer (Boston, US) | P953 |
| Marcus Jahnecke (Bad Berka) | V820 |
| Cosima Jahnke (Freiburg) | P393, V825, V828 |
| Thomas Jahnke (Kiel) | V1470 |
| Roland Jahns (Würzburg) | A1520, P152 |
| Pierre Jais (Bordeaux, FR) | V1181, V1513 |
| Heinz Jakob (Essen) | P449, P706, V1534 |
| Peter Jakob (Würzburg) | P1311, P673, P674 |
| Karl Jakobs (Essen) | P1025 |
| Christoph Jakoby (Düsseldorf) | V799 |
| Shapour Jalilzadeh (Neuherberg) | V1443 |
| Nina Janca (Lübeck) | P98 |
| Marion Janczikowski (Berlin) | V908 |
| Nikolaus Jander (Bad Krozingen) | V1218, V640 |
| Enrico Jandt (Jena) | V15, V646 |
| Alexander Jank (Berlin) | V805 |
| Ewa Jankowska (London, GB) | P436 |
| Dirk Janssen (Kiel) | P462 |
| Gerhard Janßen (Brandenburg) | I1317, P104 |
| Uwe Janssens (Aachen) | H758, V928 |
| Jim Januzzi (Boston, US) | P423 |
| Kai Jaquet (Hamburg) | V530 |
| Birgit Jaschke (München) | P960, V617 |
| Ashkan Javaheri (Hamburg) | V1556 |
| Gabriele Jedlitschky (Greifswald) | P123, P124, P997 |
| Arco Jeng (New Jersey, US) | P190 |
| Jürgen Jenne (Heidelberg) | P140 |
| Markus Jochims (Essen) | P948, V571 |
| Olaf Jöhren (Lübeck) | P132, V806 |
| Christian Johannes (München) | P678 |
| Silke John (München) | P115 |
| Binu John-Puthenveettil (Herne) | P1033 |
| Larry Jones (Indianapolis, US) | V613 |
| Larry Jones (Indianapolis, US) | P1295 |
| Habo Jongsma (Utrecht, NL) | A1162 |
| Pierre Jordaan (Bloemfontein, ZA) | P1002 |
| Jens Jordan (Berlin) | P1020 |
| Giji Joseph (Atlanta, US) | P977 |
| Andreas Jost (Ludwigshafen) | P703 |
| Marco Jost (Freiburg) | V586 |
| Claus Jünger (Ludwigshafen am Rhein) | V21 |
| Jana Jünger (Heidelberg) | P425 |
| Craig Juergens (Sydney, AU) | P1037 |
| Kai Jürgens (Münster) | V1514 |
| Thomas Jürgens (Goettingen) | P698 |
| Stevo Julius (Michigan, US) | P432 |
| Jens Jung (Worms) | V1512 |
| Oliver Jung (Frankfurt am Main) | P406 |
| Philip Jung (Würzburg) | V283 |
| Werner Jung (Villingen-Schwenningen) | H774, I1323 |
| Mirco Jungblut (Halle) | V633 |
| Stefan Junk (Homburg-Saar) | P964 |
| Steffen Just (Heidelberg) | P692 |
| Isabel Justus (Münster) | P1295 |
| Christian Jux (Göttingen) | V1219 |