| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Loverich, Tamara | Eastern Michigan University | Clinical Psychologist/Professor | Ypsilanti | United States | Michigan | View |
| Lowe, Vanessa | none | Clinical Psychologist | Berkeley | United States | California | View |
| Löwer, Lenard | none at the moment of writing | Psychologischer Psychotherapeut | Berlin | Germany | Berlin | View |
| Lowrie, Ria | BABCP UK | Psychotherapist | Carlisle | United Kingdom | | View |
| Loya, Melanie | choicetherapy | Therapist | San Francisco | United States | California | View |
| Løkke, Jon | Ostfold University College | Professor | MOSS | Norway | Østfold | View |
| Lu, Chris | Mercy Behavioral Health | Practice Administrator | Pittsburgh | United States | Pennsylvania | View |
| Lu, Michael | CML Mental Well-being and Psychological Services | Mental Well-being Coach | Paranaque City | Philippines | Metropolitan Manila | View |
| Lublinsky, Luis | Private practice / Fundacion Foro para la Salud Mental | Clinical Psychologist /Psychotherapist | Buenos Aires | Argentina | Capital federal | View |
| Lucas, Heather | Nystrom & Associates | Licensed Psychologist | New Brighton | United States | Minnesota | View |
| Lucas, Jim | Openforwards Ltd | Behavioural Psychotherapist | Birmingham | United Kingdom | West Midlands | View |
| Lucena, Larissa | ATC-Pe | Psychologist | Caruaru | Brazil | Pernambuco | View |
| Ludeña Campos, MARINA | csmc la medalla milagrosa | Asistencial | Lurin | Peru | Lima | View |
| Lueken, Michael | DPtV | Psychotherapist | Quakenbrück | Germany | Niedersachsen | View |
| Lui, Marina | x | Psychologist | 9 de julio | Argentina | Buenos Aires | View |
| Lukianova, Liubov | Psychotherapy Practicee | clinical psychologist | tbilisi | Georgia | Tbilisi | View |
| Lukman, Francisca Nathania | OSOT | Occupational Therapist, Psychotherapist | Pickering | Canada | Ontario | View |
| Luna, Lilia | Northwest Colorado Health | Behavioral Health Director | Steamboat Springs | United States | Colorado | View |
| Lund, Joshua | Marriage and Family Therapy | Marriage and Family Therapist | Wilmington | United States | Illinois | View |
| Lunderskov, Dorte | Lunderskov | Clinical Psychologist | Noerre Snede | Denmark | Århus | View |
| Lundi, Ashley | Northeast Georgia Psychological Services | Counselor | Hoschton | United States | Georgia | View |
| Lundmark, Noah | Saint Louis University | Associate Director of ASD services | Natick | United States | Massachusetts | View |
| Lunsford, Jaimie | Mind and Mood Psychological Services, PLLC | Clinical Psychologist and Owner | Greensboro | United States | North Carolina | View |
| Luo, Houyuan | Private Practice | Psychologist | Toronto | Canada | Ontario | View |
| Luoma, Jason | Portland Psychotherapy Clinc, Research, & Training Center, PC | CEO | Portland | United States | Oregon | View |
| Lupe, Stephen | Cleveland Clinic Foundation | Health Psychologist Inflammatory Bowel Disease Medical Home | Hudson | United States | Ohio | View |
| Luque Carreiro, Patrícia | IBac | Psychologist | Brasília | Brazil | | View |
| Lussier, Cara | The Mindfulness Clinic | Registered Psychotherapist | Toronto | Canada | Ontario | View |
| Luther, Mishael | Halcyon Sky Counseling, LLC | Licensed Professional Counselor | Flagstaff | United States | Arizona | View |
| Lycklama, Sandra | ADELI | psychologist | Cournon d'Auvergne | France | Puy-de-Dôme | View |
| Lydell, Tommy | Scandinavian Institute for Evidence Based Psychology AB, Capio AB, Evimind AB | Licensed psychotherapist, Licensed healthcare counselor | Stockholm | Sweden | | View |
| Lyden, Martin | self-employed | psychologist | Rensselaer | United States | New York | View |
| Lyken, Anne Dorte | Soerlandets rehabiliteringssenter | Specialist in Clinical Psychology, CRDO | Flekkefjord | Norway | | View |
| Lynch, Francis | The Finding Meaning Practice | Director | Perth | Australia | Western Australia | View |
| Lyseng, Annelise | MacEwan University | Counsellor | Edmonton | Canada | Alberta | View |
| M.B., M.B. | Owner Gentleminds | mindfulness & compassion | trainer, coach | Haarlem | Netherlands | Noord-Holland | View |
| Macari, Cara | Child Mind Institute | Clinical Social Worker | New York | United States | New York | View |
| Macera, Michelle | Hilo Medical Center | Psychologist | Hilo | United States | Hawaii | View |
| MacFarland, Mari | PARClife | Director | Plymouth | United States | Michigan | View |
| Machado Doriguello, Wagner | -Private clinic | Psicólogo Clínico e Monitor de Clínica-escola | Indaiatuba | Brazil | Sao Paulo | View |
| MacIntire, Mae | Action Potential Behavioral Health and Sport Psychology | Psychologist | Grand Junction | United States | Colorado | View |
| Mackaronis, Julia | Quinault Indian Nation | Licensed Clinical Psychologist | Taholah | United States | Washington | View |
| Macke, Greg | Victory Academy | BCBA | Sherwood | United States | Oregon | View |
| Mackenzie, Helena | Psychotherapy and Resilience, PLLC | Clinical Psychologist | Saint Paul | United States | Minnesota | View |
| Mackie, Brett | Change Your Mind Psychology | Psychologist | POINT COOK | Australia | Victoria | View |
| Mackin, Michelle | National Health Service (NHS) | Specialist Counselling Psychologist | Burton on Trent | United Kingdom | Staffordshire | View |
| Maclaughlin, Rosemary | NASW | LCSW, Psychotherapist, Professor | Sacramento | United States | California | View |
| MacLeod, Bruce | not affiliated | Psychotherapist | Edmonton | Canada | Alberta | View |
| MacLeod, Sandra | Mosaic Behavioral Consulting | Sandra Mac Leod, Ph.D., BCBA-D, Behavior Analyst | Port Angeles | United States | Washington | View |
| Madden, Kym | Self Employeed | Counselor | MARCOOLA | Australia | Queensland | View |