 This study conducted a systematic literature review on self-tracking and the quantified self in promoting health and well-being, identifying 11 research themes under three stakeholder groups, and users, patients and people with illnesses, and healthcare professionals and caregivers. The results suggest that future research should focus on users' cognitions and emotions related to processing and interpreting tracking device information, the dark side of self-tracking, self-tracking as a societal phenomenon, and systemic impacts on healthcare, and actors involved. This article was authored by Sean Fung, Maddy Mantamaki, Amandeep Durr, and others.