| Link | Location |
|---|
 | Miriam Orejana | Madrid, Spain |
| Michal Orenburg | Tel Aviv, Israel |
 | Diego Oreona | A Coruña, Spain |
| Shawna Organisciak | Denver, Colorado, United States |
| Cherukei Orianwo | London, United Kingdom |
| Vadim Orlov | Moscow, Russian Federation |
| Dominic Orme | Burgess Hill, United Kingdom |
| Christoph Ornth | München, Germany |
| Veruska Oropeza | San Francisco, California, United States |
| Erich Orozco | Atlanta, Georgia, United States |
| Tracy Orrison | Washington D.C., , United States |
 | Christian Orsatti | Sophia Antipolis, France |
| Ronald Orsi | New York, New York, United States |
| Andrea Ortalda | Ubtershcleissheim, Germany |
 | Stefano Ortalda | Turin, Italy |
