| Name | Track | Diplomate Status | Certified Date | Expires |
|---|---|---|---|---|
| Richard K. Olney | CNP | Diplomate | 9/16/1984 | Never |
| Donald M. Olson | CNP | Diplomate | 10/1/1988 | Never |
| Walter Olson | CNP | Diplomate | 6/14/1981 | Never |
| Sandra F. Olson | EEG | Diplomate | 12/31/1969 | Never |
| Betty Y. Ong | CNP | Diplomate | 10/1/1988 | Never |
| Ligia V. Onofrei | NIOM | Non-Diplomate | 11/30/2020 | 12/31/2030 |
| K.J. Oommen | CNP | Diplomate | 12/31/1986 | Never |
| Afag M. Osman | CNP | International | 6/20/2015 | 12/31/2025 |
| Ivan Osorio | CNP | Diplomate | 4/27/1985 | Never |
| Joel M. Oster | NIOM | Diplomate | 6/20/2015 | 12/31/2025 |
| Joel M. Oster | CC-EEG | Diplomate | 10/24/2015 | 12/31/2025 |
| Joel M. Oster | EM | Diplomate | 10/28/2007 | 12/31/2027 |
| Mortimer Ostow | EEG | Diplomate | 12/31/1952 | Never |
| Arlie Scott Overfield | CNP | Diplomate | 12/2/1989 | Never |
| Aysegul Ozer Celik, M.D. | CNP | International | 11/16/2024 | 12/31/2034 |
| Aysegul Ozer Celik, M.D. | EM | International | 6/15/2024 | 12/31/2034 |
| Bernard L. Pacella | EEG | Diplomate | 12/31/1952 | Never |
| Victor Hugo Pacheco | NIOM | Diplomate | 6/1/2019 | 12/31/2029 |
| Geronimo Pacheco Aispuro | CNP | International | 11/18/2023 | 12/31/2033 |
| Steven Pacia | CNP | Diplomate | 3/23/1996 | Never |
| Alison Pack | EM | Diplomate | 5/5/2001 | 12/31/2011 |
| Lindsay M. Pagano | CC-EEG | Diplomate | 6/18/2022 | 12/31/2032 |
| Artemio G. Pagdanganan | EEG | Diplomate | 12/31/1967 | Never |
| Alfred LeBron Paige | EM | Non-diplomate | 11/13/2010 | 12/31/2030 |
| Joyoung Pak | CNP | Diplomate | 4/24/1993 | Never |
|
1627 Certificants
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