| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Oren, Amir | Bridges Therapy Centre | Psychologist | London | United Kingdom | | View |
| Oren, Orit | Bridges Therapy Centre | Counsellor | London | United Kingdom | | View |
| Oren, Yelena | Private Practice | Licensed Psychologist | Reno | United States | Nevada | View |
| Orive, Maira | Universidad Nacional de Rosario | Psicóloga | Rosario | Argentina | Santa Fe | View |
| Orme, Lee Ann | Private Practice | LMFT | TUSTIN | United States | California | View |
| Orpianesi, Cinderella | Mid Yorkshire NHS Trust | Licenciada en Psicología | Villa Maria | Argentina | Cordoba | View |
| Orrico, Maria | Private | Psicólogo | Montevideo | Uruguay | Montevideo | View |
| Ortega, Daniela | MP 2137 | Licenciada en Psicologia | Bahía Blanca | Argentina | Buenos Aires | View |
| Ortiz, J. Alexis | Stanford University School of Medicine | Psychologist | San Francisco | United States | California | View |
| Ortiz, Sebastián | CIPSYC / Private Clinic. | Psychologist | Santiago | Chile | Santiago Metropolitan | View |
| Orzechovski, Karina | Colegio de Psicólogos de la Provincia de Buenos Aires | Psicologa | Banfield | Argentina | Buenos Aires | View |
| Osemwegie, Stella | YOMU Counseling Arts, LLC | Therapist | Phillipburg | United States | New Jersey | View |
| Oss-Emer, Mark | s35 | Resident Support Officer | Caboolture | Australia | Queensland | View |
| Oss, Moniek | Van Oss Psychotherapie & Coaching | Therapist coach | Tilburg | Netherlands | Noord-Brabant | View |
| Ossman, Wendy | Rhode Island Cognitive Behavioral Therapy (RICBT) | Clinical Psychologist | North Kingstown | United States | Rhode Island | View |
| Ostacher, Laurie | Stanford Healthcare | Clinical social worker/therapist, Oncology | Stanford | United States | California | View |
| Ostrow, Ellen | Lawyers Life Coach LLC | Psychologist/Executive Coach | Rockville | United States | Maryland | View |
| Ostrowska, Barbara | University of Social Sciences and Humanities in Poznań | Psychologist | Zbaszyn | Poland | wielkopolskie | View |
| Oswald, Gregory | Plainfield Counseling Center | Clinical Psychologist / President | Plainfield | United States | Illinois | View |
| Otero, Vera | Clínica de Psicologia | clinical psychologist | Ribeirão Preto | Brazil | Sao Paulo | View |
| Otrén, Martin | Otrén Psykologi AB | CEO | Stockholm | Sweden | Stockholms län | View |
| Ott, Ralph | Bristol Lifestyle Recovery | Clinical Director | Pennington Gap | United States | Virginia | View |
| Ottati, Alicia | Ottati Psychotherapy LLC | Clinical Psychologist | Dayton | United States | Ohio | View |
| Oudet, Carole | N | Art thérapeute | Porto Novo | Benin | Oueme | View |
| Oules, Crissy | NYU School of Social Work | LMSW | Brooklyn | United States | New York | View |
| Ovadia, Veronica | ITA | MSW - CBT therapist | Shoham | Israel | HaMerkaz | View |
| Owen, Ray | Dr Ray Owen, Psychology Services | Consultant Clinical Psychologist (Cancer & Palliative Care / Health Psychology) | | United Kingdom | | View |
| Oya, Aiko | Doshisha University | Assistant Professor, Clinical Psychologist | Kyotanabe | Japan | Kyoto | View |
| Oyarzún, Bryan | Hospital Provincial San Agustin | Psicólogo | La Ligua | Chile | Valparaiso | View |
| Ozbek, Selen | Valued Wellbeing | Psychologist | London | United Kingdom | | View |
| Ozretich, Bart | Shamatha Psychotherapy | Psychotherapist | Seattle | United States | Washington | View |
| Østergaard, Tom | Psychiatry Department SSHF | Psychologist | Arendal | Norway | Aust-Agder | View |
| Paavilainen, Mirka | Self-employed private practice | Psychologist, psychotherapist | Tampere | Finland | Tampere Region | View |
| PACHECO GOMIDE, CIBELE | Instituto Par - Centro de Ciências e Tecnologia do Comportamento | Psychologist | São Paulo | Brazil | Sao Paulo | View |
| Pacheco, Sofía | CIPCO | Licenciada en Psicología | Córdoba | Argentina | | View |
| Paci, Melanie | In private practice | Clinical Psychologist | Dobbs Ferry | United States | New York | View |
| Padda, Gurpreet | Center for Interventional Pain Management | Physician | St. Louis | United States | Missouri | View |
| Paddock, Steve | RN | Associate charge nurse manager | Dunedin | New Zealand | Otago | View |
| Paggeot, Amy | Amy Paggeot, PhD, PLLC | Psychologist | Ann Arbor | United States | Michigan | View |
| Pagonas, Konstantin | Private Practice | Non-Medical Practitioner for Psychotherapy | Frankfurt am Main | Germany | Hessen | View |
| Paillao, Hugo | None presently | Psychotherapist | Temuco | Chile | Araucania | View |
| Pal, Elizabeth | BACB | BCBA and Provisionally Licensed Psychologist | | Cayman Islands | | View |
| Palacio, Inés | Universidad Nacional de Córdoba | psychotherapist | Alta Gracia | Argentina | Cordoba | View |
| Palamara, Sherry | APA | Licensed Psychologist, Licensed Massage Therapist, Mindfulness Meditation Teacher | Miami Beach | United States | Florida | View |
| Paley, Anne | Southcentral Foundation, Child and Family Developmental Services | BCBA/Clinical Supervisor | Anchorage | United States | Alaska | View |
| Palm Reed, Kathleen | Clark University | Associate Professor | Worcester | United States | Massachusetts | View |
| Palmer, Claire | Arrive Counseling | Psychotherapist | Austin | United States | Texas | View |
| Palmer, Katie | BACB | BCBA | Boise | United States | Idaho | View |
| Palmisano, Barbara | Palmisano Psychological Services | Clinical Psychologist | Hillarys | Australia | Western Australia | View |
| Palozzo, Maria | CEETA. Centro de Estudios Especializados en Ansiedad | clinical psychologist | Capital Federal | Argentina | Capital federal | View |