The Artefacts of Digital Mental Health focuses on smartphone apps, wearables devices, and ingestible sensors, which are at the centre of research, development, and investment in mental health and digitalisation. The book aims to examine digital mental health through three artefacts that are defined by their ubiquity, everydayness, popularity, innovation and hype, and emergent qualities. It engages with theoretical approaches to technology, mental health, and wellbeing informed by Science and Technology Studies, sociological studies of health and mental health, and sociomaterialism. The book brings together different theories of mental health, subjectivity, the body, care, and digitalisation alongside biodigital artefacts as exemplars of transformations in digital mental health.