| Name - First (Maiden) Last | Credential | Cert Number | Issue Date | Expiration Date |
|---|---|---|---|---|
| Oscar Padilla | CNIM | 3338 | 2015-10-31 | 2025-12-31 |
| Oscar Aldana | CLTM | 480 | 2020-07-02 | 2025-12-31 |
| Oscar Rojo | R. EEG T. | 8786 | 2023-05-05 | 2028-12-31 |
| Oshia Slayden | R. EEG T. | 5715 | 2015-10-31 | 2025-12-31 |
| Oshia Slayden | CLTM | 346 | 2017-11-21 | 2027-12-31 |
| Osmani R. Cruz | R. EEG T. | 3527 | 2002-05-18 | 2022-12-31 |
| Osmani R. Cruz | R. EP T. | 1387 | 2014-09-20 | 2019-12-31 |
| Ossama Gaid | R. EEG T. | 9209 | 2024-10-12 | 2029-12-31 |
| Otakhon Matchanov | R. EEG T. | 6084 | 2017-01-28 | 2022-12-31 |
| Otakhon Matchanov | CNIM | 4589 | 2020-06-22 | 2025-12-31 |
| Otto Trapage | R. EEG T. | 8310 | 2022-02-19 | 2027-12-31 |
| Ovie C. Smith | CNIM | 505 | 2002-05-04 | 2027-12-31 |
| Ovsanna Zakarian | R. EEG T. | 3360 | 2000-06-11 | 2025-12-31 |
| Ovsanna Zakarian | R. EP T. | 727 | 1999-08-15 | 2009-12-31 |
| Owen Murphy | CNIM | 4583 | 2020-06-10 | 2025-12-31 |
| Owen Kimbrel | CNIM | 4909 | 2021-12-14 | 2026-12-31 |
| Owings, . Crystal J | R.NCS.T. | 964 | 2006-01-10 | Lifetime |
| Oxana Pavlova | CNIM | 1624 | 2008-08-16 | 2028-12-31 |
| P. Carol Vasquez | R. EP T. | 974 | 2008-07-20 | 2028-12-31 |
| P. Carol Vasquez | R. EEG T. | 3767 | 2004-08-21 | 2029-12-31 |
| PABLO CABALLERO | R. EEG T. | 1788 | 1988-02-21 | 2023-12-31 |
| Pablo Ysunza | CNIM | 2529 | 2012-08-11 | 2022-12-31 |
| Pablo Galicia Almanza | CNIM | 4063 | 2018-05-11 | 2028-12-31 |
| Padmanaban Vijayan | R. EEG T. | 4552 | 2010-07-18 | 2025-12-31 |
| Padmanaban Vijayan | R. EP T. | 1204 | 2011-08-13 | 2026-12-31 |