| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| O'Brien, Maxine | AODS, Darling Downs HHSD | Advanced Psychologist | Toowoomba | Australia | Queensland | View |
| O'Connell, Aaron | Primary Care | clinical psychologist | Auckland | New Zealand | Auckland | View |
| O'Connell, Jenna | NZROT | Health Improvement Practitioner | | New Zealand | | View |
| O'Connell, Manuela | Universidad de Favaloro | psychologist | Buenos Aires | Argentina | | View |
| O'Connell, Sean | Psychological Society of Ireland | Psychologist | Dublin and Limerick | Ireland | Dublin | View |
| O'Connor, John | HCPC | Clinical Psychologist | Haslemere | United Kingdom | West Sussex | View |
| O'Connor, Katerina | University of Exeter | Counsellor/psychotherapist | EXETER | United Kingdom | Devon | View |
| O'Dwyer, Keelin | Psychological Society of Ireland | Head of Clinical & Coaching Services | Co.Dublin | Ireland | Dublin | View |
| O'Flinn, Shannon | Private Psychology Practice | Psychologist | Pasadena | United States | California | View |
| O'Kane, Ann | AASW | Counsellor | Brunswick South | Australia | Victoria | View |
| O'Loughlin, Lisanne | IACP | Psychotherapist/Counsellor | Dublin | Ireland | Dublin | View |
| O'Neil-Hart, Shane | Lyra Health, UCSF | Clinical Director / ACT Coach, Therapist and Trainer | Burlingame | United States | California | View |
| O'Neil, Adam | Atlas Psychology | Psychologist | Boulder | United States | Colorado | View |
| Obiri, Funmi | Tanya Morrel and Associates | Psychotherapist | Towson | United States | Maryland | View |
| Ocanas, Monique | Endeavor Health | LCPC | Mokena | United States | Illinois | View |
| Ochsner Margolies, Skye | UNC School of Medicine | Clinical Psychologist/Associate Professor | Chapel Hill | United States | North Carolina | View |
| ODELL, SEAN | Beyond the Horizon, PLLC | Owner | Harrisburg | United States | Pennsylvania | View |
| Odnoshivkina, Анастасия | Self-employed private practice | psychologist | Moscow | Russian Federation | | View |
| Oh, Timothy | The Counseling Center Group | Psychotherapist | New York | United States | New York | View |
| Ohtsuki, Tomu | Waseda University | Professor | Tokrozawa | Japan | Saitama | View |
| Ojala, Kristin | N/A | Clinic Director | Snohomish | United States | Washington | View |
| Ojeda Oquendo, Carmen | PIAC S.A | Psychologist | Guayaquil | Ecuador | Guayas | View |
| Ok, Zeynep | Marmara University | Psychologist | İstanbul | Turkey | Istanbul | View |
| Okumura-Clark, Alvaro | Universidad de Lima | Clinical Psychologist | Lima | Peru | Lima | View |
| Okwuosa, Ijoma | NOW Counseling | Therapist | New Haven, CT | United States | Connecticut | View |
| Olarte-Hayes, Sandra | Lime Tree Therapy, PLLC | Owner | Austin | United States | Texas | View |
| OLAZ, Fabián | Centro Integral de Psicoterapias Contextuales (CIPCO). Facultad de Psicología. Universidad Nacional de Córdoba. | PhD. Psychoterapist. Assistant Professor | Cordoba | Argentina | Cordoba | View |
| OldenKamp, Susan | CBT Center of Idaho | Licensed Clinical Professional Counselor | Caldwell | United States | Idaho | View |
| Oliveira, Ana Carmen | Paradigma - Centro de Ciências e Tecnologia do Comportamento | Researcher | São Paulo | Brazil | Sao Paulo | View |
| oliveira, Cassia | brasileira | psicologa | porto alegre | Brazil | Rio Grande do Sul | View |
| Oliveira, Iliuska | Membro | Psicóloga | Ribeirão Preto | Brazil | | View |
| Oliver, Debra | NZPsS | Psychologist | New Plymouth | New Zealand | Taranaki | View |
| Oliver, Joe | Contextual Consulting/ University College London | Consultant Clinical Psychologist | London | United Kingdom | | View |
| oliver, jonah | MAPS, AHPRA | Psychologist - Director | Mermaid Beach | Australia | Queensland | View |
| Oliver, Mark | Cumbria, Northumberland, Tyne and Wear NHS Foundation Trust | Clinical Psychologist | Morpeth | United Kingdom | Northumberland | View |
| Olkowski, Jennifer | Jenuine Courage Counseling | Mental Health Therapist | Menasha | United States | Wisconsin | View |
| Ollen, Elizabeth | UCLA Medical Center and Independent Private Practice | Psychologist | LOS ANGELES | United States | California | View |
| Olmos, Micaela | Universidad Nacional de Córdoba | psychologist | Córdoba | Argentina | Cordoba | View |
| Olson-Madden, Jennifer | Private practice in Denver,CO | Psychologist | Denver | United States | Colorado | View |
| Ong, Stella | Singapore Association for Counselling | Psychotherapist & Counsellor | Singapore | Singapore | | View |
| Ono, Susan | mindfulSF | Psychologist | Alameda | United States | California | View |
| Oonk, Wouter | To Act | Psychomotorisch therapeut/ EIgen zaak | Dalfsen | Netherlands | Overijssel | View |
| Oppo, Annalisa | Sigmund Freud University | Dr. | Milano | Italy | Milano | View |
| Opsahl, Noelle | Private Practice | Psychologist | Hyattsville | United States | Maryland | View |
| oras, esra | İYİ GÜN Psikoloji- Good Day Psychology | Psikolog-Psikoterapist | istanbul | Turkey | Istanbul | View |
| Orcutt, Holly | Northern Illinois University | Professor | DeKalb | United States | Illinois | View |
| Ordonez, Alicia | PAM, MPS | Psychologist | Winnipeg | Canada | Manitoba | View |
| Orellana, Mayra | Mayra Orellana | Licenciada en psicología | Hurlingham | Argentina | Buenos Aires | View |
| Oren, Amir | Bridges Therapy Centre | Psychologist | London | United Kingdom | | View |
| Oren, Orit | Bridges Therapy Centre | Counsellor | London | United Kingdom | | View |