This open access book explores epistemic justice in mental healthcare, bringing together perspectives from psychologists, psychiatrists, philosophers, activists, and lived experience researchers. Through eight chapters, authors identify threats to the agency of people who hear voices, experience depression, have psychotic symptoms, live with dementia, are diagnosed with personality disorders, and face serious mental health issues while receiving palliative care. Considering the power asymmetries in clinical interactions, where patients are vulnerable and healthcare professionals are uniquely placed to offer support, this book reaffirms the importance of recognizing patients as agents and collaborators. Topics covered include trust in the therapeutic relationship, dignity at the end of life, the social dimension of health, stigma in an acute ward, the harm caused by biases and stereotypes, the role of clinical communication, and the promise of digital health. Students, academic researchers, practitioners, as well as mental health charities will benefit from this timely collection.