Objectives. The way that individuals perceive themselves and others may be relevant in understanding difficulties with self-harm. Repertory grids provide a relatively underutilized means of investigating self-concept in people who self-harm. This study aimed to examine the association between self-concept, captured through a repertory grid method, and self-harm.Method. Ninety-eight participants with a history of self-harm took part in the study. A repertory grid was used to derive distances between four elements ('current self', 'ideal self', 'self-harming self', and 'others who self-harm'). Associations between these distances and measures of self-harm behaviour, well-being and perceived recovery, were estimated.Results. Repertory grid distances were significantly associated with self-harm. When adjusting for covariates, self-harm in the past year was positively associated with a greater distance (or less perceived similarity) between current and ideal self, and a smaller distance (greater perceived similarity) between current self and others who self-harm. Repertory grid distances were also associated with well-being and perceived recovery.Conclusions. The results are consistent with the idea that self-perception is associated with self-harm and related difficulties. The results also highlight the potential utility of repertory grids as a tool for exploring self-concept. The cross-sectional nature of the study precludes inferences about directionality or the temporal characteristics of associations. Practitioner pointsMore recent experiences of self-harm may be reflected in the way individuals perceive or construe themselves.The way in which individuals who self-harm perceive or construe themselves may also be related to their current well-being and perceived recovery.Repertory grids may be a useful tool in clinical practice for investigating self-concept in those who selfharm.Repertory grids may provide a more idiographic, clinical outcome assessment in those who self-harm.