This article presents the findings of a systematic qualitative analysis of research in the ethics of digital trace data use in learning and education. From the resulting analysis of 77 peer-reviewed studies, we (1) map the characteristics of research by study type, academic community, institutional setting, and national context; (2) identify the primary ethical concerns and related responses; and (3) highlight the research gaps. Four areas of focus are identified in this emerging area: (1) privacy, informed consent, and data ownership; (2) validity and integrity; (3) ethical decision making; and (4) governance and accountability. We highlight the lack of evidence particularly for preschool and school-aged children and the disparate communities working in this domain, and we suggest a more cohesive approach, where the wider learning and educational ecosystem is recognized, explicit engagement with ethical theory is central, and mid- to long-term ethical issues are considered alongside immediate concerns.