| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Nuñez, Marcelo | Licenciado en psicologia | Licenciado | Capital Federal | Argentina | Capital federal | View |
| Nuriel-Porat, Vered | N/A at present | Clinical Social Worker | Jerusalem | Israel | Jerusalem | View |
| Nusbaum, Alexis | Retired VHA, private practice | Clinical Psychologist | Ellicott City | United States | Maryland | View |
| Nyman, Ahti | Vamk & Noste | Psykoterapeutti | Vaasa | Finland | Ostrobothnia | View |
| O Adams, Randall | ReEntry House | Therapist | ST LOUIS PARK | United States | Minnesota | View |
| O Dell, Brooke | Roseburg Therapy | Mental Health Therapist | Roseburg | United States | Oregon | View |
| O Flaherty, Sheila | IACP | Psychotherapist | Dublin | Ireland | Dublin | View |
| O'Brennan, Lindsey | Morningstar Wellness | Licensed Psychologist / Owner | Tampa | United States | Florida | View |
| O'Brien, Karen | Psychological Assocation of Manitoba | Clinical Psychologist | Winnipeg | Canada | Manitoba | View |
| O'Brien, Kelly | Summit Emotional Wellness | Psychologist | Silver Spring | United States | Maryland | View |
| O'Brien, Mary | University of South Florida | Owner at Jersey Behavior Consulting LLC | Cherry Hill | United States | New Jersey | View |
| O'Connell, Aaron | Primary Care | clinical psychologist | Auckland | New Zealand | Auckland | View |
| O'Connell, Manuela | Universidad de Favaloro | psychologist | Buenos Aires | Argentina | | View |
| O'Connor, Katerina | University of Exeter | Counsellor/psychotherapist | EXETER | United Kingdom | Devon | View |
| O'Dowd, Katie | TrueLife Psychotherapy and Consultation, Inc. | Psychologist | Torrance | United States | California | View |
| O'Dwyer-Rea, Keelin | Dublin Business School | Coaching Psychologist | Donnybrook | Ireland | Dublin | View |
| O'Flinn, Shannon | Private Psychology Practice | Psychologist | Pasadena | United States | California | View |
| O'Grady, Chris | Flinders University | Student Counsellor | Adelaide | Australia | South Australia | View |
| O'Kane, Ann | AASW | Counsellor | Brunswick South | Australia | Victoria | View |
| O'Kane, Michael | Wholeview Wellness | Clinical Psychologist | New York | United States | New York | 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 |
| Obel, Zacharias | University of Copenhagen, Institute of Psychology | Psychologist | Nykøbing Falster | Denmark | Storstrøm | View |
| Obiri, Funmi | Tanya Morrel and Associates | Psychotherapist | Towson | United States | Maryland | View |
| Obst, Gisela | Selbstständig | Psychologische Beratung | Köln | Germany | Nordrhein-Westfalen | 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 |
| Office, Nicholas | University of Chicago SSA | Clinical Social Worker | Chicago | United States | Illinois | View |
| Oggioni, Carlotta | ASCCO, Parma, Italy | Student | Parma | Italy | Parma | View |
| ogura, gen | Startline CO.,LTD. | Director | Kamirenjaku Mitaka-si | Japan | Tokyo | View |
| Oh, Timothy | The Counseling Center Group | Psychotherapist | New York | United States | New York | View |
| Ojala, Kristin | N/A | Behavior Analyst, Educational Consultant | 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 |
| Oladipupo, Oyinkansola | Member Malta Chamber of Psychologist | Clinical Psychologist Practitioner | L-Imsida | Malta | | 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 |
| Oleyki, Homayoun | Esfahan | Student | Esfahan | Iran, Islamic Republic of | | View |
| Oliveira, Filipe | no one | self-employed clinical psychologist | Juiz de Fora | Brazil | Minas Gerais | 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 |
| Olivera II, Arnaldo | American Board of Sexology Diplomate | Licensed Marriage and Family Therapist/Clinical Sexologist | Orlando | United States | Florida | View |
| Oliveros, Juan | Universidad Católica del Maule | Assistant Professor | Talca | Chile | Maule | View |
| Olkon, Sara | Clarity Relationship Therapy | psychotherapist | Chicago | United States | Illinois | 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 |