• O'Halloran, Sophie, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, United Kingdom
• O'Reilly, Gary, School of Psychology, University College Dublin, Dublin, Ireland
• Odyniec, Patrizia, Department of Psychology and Psychotherapy, Universität Witten/Herdecke, Witten, Germany
• Oliveira, João Tiago, CIPsi – Psychology Research Center, School of Psychology, University of Minho, Braga, Portugal
• Olsson Lynch, Cecilia, Department of Psychology, Uppsala University, Uppsala, Sweden
• Onwumere, Juliana, Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, United Kingdom; South London and Maudsley NHS Foundation Trust, London, United Kingdom
• Orbell, Sheina, Department of Psychology, University of Essex, Colchester, United Kingdom
• Overmeyer, Rebecca, Faculty of Psychology, Institute of Clinical Psychology and Psychotherapy, Chair for Addiction Research, Technische Universität Dresden, Dresden, Germany
• O’Donovan, Claire E., Department of Psychological Medicine, University of Auckland, Auckland