Non-suicidal self-injury (NSSI) is on the rise but still met with stigma and lack of tolerance. Research has mostly focused on investigating tolerance towards NSSI within the healthcare system, yet factors affecting tolerance among the public remain speculative. Peers and families of those with NSSI receive most disclosures, making their tolerance a vital part of an individual’s help-seeking experience. This study aims to investigate lifetime prevalence for NSSI and explore factors that could contribute to tolerance towards NSSI in Swedish university students (n=1430). Results revealed that lifetime prevalence of NSSI stood at 38.7% and almost two in three reported knowing someone with NSSI. A multiple regression model analysis then revealed that personal experience of NSSI and/or mental health problems, being female, and knowing someone with NSSI significantly predicted higher tolerance towards NSSI. Together, they explained 16% of the variation in tolerance. The first three factors are expected, however the small but significant contribution of knowing someone with NSSI could be important in campaigns aimed at reducing public stigma to NSSI. The theoretical basis lies in the exposure of stigmatised groups to non-stigmatised groups; however, this needs to be researched further.