| Name | Affiliation | Occupation / Position Title | City | Country | State | |
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| Mashal, ABPP, Nehjla | Pacific Anxiety Group | Clinical Psychologist | San Francisco | United States | California | View |
| Mason, Erin | LCSW Private Practice | Psychotherapist, LCSW | Los Angeles | United States | California | View |
| Masterpasqua, Frank | Inst for Graduate Clinical Psychology, Widener University | Professor | Swarthmore | United States | Pennsylvania | View |
| Masterson Tilford, Stacy | Hamilton County Educational Service Center | Behavior Analyst | Cincinnati | United States | Ohio | View |
| Matacz- Szymanowicz, Iwona | NZOZ Diada NFZ Pyskowice, ODT Pozytywka | psychoterapeuta | Zabrze | Poland | śląskie | View |
| Mather, Doug | The Creation Company (2020) Ltd | Specialist in Human Behaviour | London | United Kingdom | London | View |
| Matheus, Daniela | CRP 08/12002 | Clinical Psychologist | Curitiba | Brazil | Parana | View |
| Mathew, LCSW, Charly | LCSW-C | LCSW | Davie | United States | Florida | View |
| Mathews, M.D., Pamela | Baylor Scott and White Health | adjunct professor in psychiatry | Temple | United States | Texas | View |
| Matisz, Jenna | New Horizons Therapy | Registered Social Worker/Psychotherapist | Waterloo | Canada | Ontario | View |
| Matsen Devitt, Julie | D Waters and Associates LLC | Psychologist | Hazlet | United States | New Jersey | View |
| Matthijssen, Denise | Pivate practice | familytherapist and coach | Ingen | Netherlands | | View |
| Mattoli, Scarlett | Psynamo Limited | Director/Clinical Psychologist | Central | Hong Kong | Central and Western | View |
| Maviglia, Adrienne | ABAI | Clinical Executive Director | Goshen | United States | New York | View |
| Maxey, C. David | C. David Maxey, M.A. | Licensed Psychologist Associate | Portland | United States | Oregon | View |
| May, Robin | Australian Psychological Society, Australian Association of Smoking Cessation Specialists, Australian Association of Cognitive & | Psychologist | St Leonards | Australia | New South Wales | View |
| Maynard, Patricia | Tapestry Wellness Counseling Practice | Clinical Director | Memphis | United States | Tennessee | View |
| Mays, Iain | Psychological Society of Ireland | Senior Clinical Psychologist | Cork | Ireland | Cork | View |
| Mazurczak, Agnieszka | pomocnia | Ma in psychology | poznan | Poland | wielkopolskie | View |
| Mazzei, Rae | Evolutions Behavioral Health Services | Health Psychologist | Chandler | United States | Arizona | View |
| Mazzeo, Gabriela | Equipo Fons | Psicoterapeuta | Bahía Blanca | Argentina | Buenos Aires | View |
| Mc Carroll, Paul | Northern Health Social Care Trust | ACT Coach/Therapist/ Peer Recovery Trainer | Belfast | United Kingdom | Co Antrim | View |
| McAnulty, David | Abilene Christian University | Professor of Psychology | Abilene | United States | Texas | View |
| McArdle, Paige | Children's Mercy Hospital | Psychologist | Overland Park | United States | Kansas | View |
| McArthur, Katharine | N/A at present | Mental Health Provider | Monona | United States | Wisconsin | View |
| McArthur, Laurel | Resilience Clinical Psychology | Clinical Psychologist | Auckland | New Zealand | | View |
| McAulay, John | Mashall Health Psychiatry | Psychologist / Assistant Professor | Huntington | United States | West Virginia | View |
| McBeath, Jennifer | CCTNB | Counsellor | Moncton | Canada | New Brunswick | View |
| McBrain, Philip | Contact Awareness Counseling LLC | Mental Health Counselor | Boulder | United States | Colorado | View |
| McBroom, Callie | Inner Growth Counseling | LCSWA, CSW, LSSW | Chapel Hill | United States | North Carolina | View |
| McCabe, D'Arcy | Private Practice | MSW, RSW, Social Worker, Psychotherapist | Toronto | Canada | Ontario | View |
| McCabe, Katie | Self-employed private practice | Therapist | Westport | United States | Connecticut | View |
| McCall, Deanna | Socail Work | Counsellor | Callaghan | Australia | New South Wales | View |
| McCall, Rainier | Endeavor to Hope Counseling, LLC | LMHC/Owner | Saint Petersburg | United States | Florida | View |
| McCamey, R. Mason | LPC | LPC | Dallas | United States | Texas | View |
| McCandless, James Daniel | BABCP | Cognitive Behavioural Psychotherapist | London | United Kingdom | London | View |
| McCann, Sean | Helping Wind Wellness, LLC | Therapist | Philadelphia | United States | Pennsylvania | View |
| McCaskill, Deanna | Deanna G McCaskill, LLC | Owner/Therapist | Oviedo | United States | Florida | View |
| McCauley, Ellis | Private Psychology Practice | LMFT Psychotherapist Lic #52057 | Richmond | United States | California | View |
| McChesney, Kathleen | University of Colorado Anschutz Medical Campus | Licensed Clinical Psychologist | Aurora | United States | Colorado | View |
| McColl Brooks, Allison | CRPO | Psychotherapst | Toronto | Canada | Ontario | View |
| McConnell, Chris | APCP | Psychotherapist / Counsellor | Dublin | Ireland | | View |
| McCormack, Sarah | IACP | Psychotherapist | Co. Laois | Ireland | Laois | View |
| McCracken, Lance | Uppsala University | Professor of Clinical Psychology | Uppsala | Sweden | Uppsala län | View |
| McCurry, Chris | Self Employed Psychologist | Clinical Child Psychologist | Seattle | United States | Washington | View |
| McCurry, Susan | University of Washington/ABCD PLLC | Research Professor Emeritus/Psychologist | Seattle | United States | Washington | View |
| McCutcheon, Kevan | | Clinical Psychologist | Peninsula | United States | Ohio | View |
| McDade-Montez, Elizabeth | Private Psychology Practice | Psychologist | Capitola | United States | California | View |
| McDonald-Fix, Christin | Nationwide Children's Hospital | Licensed Psychologist; Board Certified Behavior Analyst | Westerville | United States | Ohio | View |
| McDonald, Alexa | Addenbrookes Hospital | Clinical Psychologist | | United Kingdom | | View |