| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 210 | Ontiveros Ileana | México | 155 | 27/06/2013 |
| 442 | Oms Marçal | España | 12 | 29/12/2009 |
| 53 | Olmos Juana | España | 1598 | 06/01/2010 |
| 789 | Olmos Cristian | España | 3 | 28/02/2017 |
| 620 | Olmo Muñoz Julian | España | 7 | 27/02/2016 |
| 334 | Ollé Joan | España | 30 | 20/09/2009 |
| 999 | Olivares Sheyla | España | 1 | 05/04/2011 |
| 655 | Ohallorans Morejon Victor | Cuba | 3 | 03/09/2017 |
| 956 | Nuño Brandon | México | 1 | 21/04/2012 |
| 39 | Novoa Mendoza Francisco Javier | España | 1368 | 05/12/2007 |
| 957 | Novo De La Fuente Ivan | España | 1 | 01/12/2011 |
| 552 | Novelo Rodrigo | México | 7 | 04/03/2012 |
| 1013 | Noir Hache | España | 9 | 16/05/2015 |
| 793 | Nitram Olbap | Argentina | 2 | 22/08/2010 |
| 412 | Niño German | Venezuela | 32 | 12/04/2010 |
| 839 | Nin Leo | Argentina | 1 | 13/05/2010 |
| 216 | Nieto Nacho | España | 140 | 27/02/2010 |
| 111 | Nicholls G. Samuel E. | Colombia | 591 | 12/03/2012 |
| 986 | Neira Jesus | Venezuela | 1 | 09/11/2021 |
| 615 | Navarro Prieto Pepa | España | 7 | 20/07/2015 |