Self-affirmation, operationalized as value-affirmation interventions, can have long-term beneficial effects on the academic performance and trajectories of members of negatively stereotyped groups, thus reducing achievement gaps. Yet, there is significant heterogeneity in the effectiveness of value affirmations, and we do not yet have a clear understanding of why. In this introduction to the special issue, we review the literature on self-affirmation theory in educational contexts, providing overviews of the heterogeneity in the effectiveness of affirmation interventions, the methods of implementation, potential moderators, and underling processes. We identify several questions that are important for researchers to address, the answers to which would progress the field towards being able to more confidently implement value-affirmations in contexts in which, and/or for groups for whom, they are most likely to produce benefits. We then introduce the articles included in this special issue, which showcase several of the latest theoretical and empirical advances to self-affirmation theory in educational contexts. Some groups of students-typically members of groups who have low status in wider society, such as some ethnic or racial groups, those from lower social classes, or those with immigrant backgrounds-have, on average, worse educational outcomes than others. Across societies, such inequalities in educational outcomes (henceforth educational inequalities) exist from the earliest years through to tertiary education, and their effects continue throughout the lifespan (Department for Education in England, 2020; Nation's Report Card, 2019;OECD, 2015). Indeed, an individual's level of education is a key predictor of a range of life outcomes (Hout & DiPrete, 2006),This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.