| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 213 | Ontiveros Ileana | México | 155 | 27/06/2013 |
| 446 | Oms Marçal | España | 12 | 29/12/2009 |
| 54 | Olmos Juana | España | 1598 | 06/01/2010 |
| 783 | Olmos Cristian | España | 3 | 28/02/2017 |
| 613 | Olmo Muñoz Julian | España | 7 | 27/02/2016 |
| 336 | Ollé Joan | España | 30 | 20/09/2009 |
| 999 | Olivares Sheyla | España | 1 | 05/04/2011 |
| 655 | Ohallorans Morejon Victor | Cuba | 3 | 03/09/2017 |
| 964 | Nuño Brandon | México | 1 | 21/04/2012 |
| 42 | Novoa Mendoza Francisco Javier | España | 1368 | 05/12/2007 |
| 963 | Novo De La Fuente Ivan | España | 1 | 01/12/2011 |
| 555 | Novelo Rodrigo | México | 7 | 04/03/2012 |
| 1013 | Noir Hache | España | 9 | 16/05/2015 |
| 796 | Nitram Olbap | Argentina | 2 | 22/08/2010 |
| 404 | Niño German | Venezuela | 32 | 12/04/2010 |
| 844 | Nin Leo | Argentina | 1 | 13/05/2010 |
| 215 | Nieto Nacho | España | 140 | 27/02/2010 |
| 113 | Nicholls G. Samuel E. | Colombia | 591 | 12/03/2012 |
| 982 | Neira Jesus | Venezuela | 1 | 09/11/2021 |
| 608 | Navarro Prieto Pepa | España | 7 | 20/07/2015 |