This national exploratory study examined the perceptions of secondary school counselors' (n = 81) understanding of non-suicidal self-injury (NSSI). Two one-way ANOVAs revealed no statistically significant differences between middle and high school counselors on their perceptions of the prevalence of NSSI. Descriptive analyses revealed that a majority of participants lacked confidence in providing information about NSSI to school personnel. Recommendations for school counselors are provided. (Contains 1 table.)