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Previous research using self‐report measures has shown an association between nonsuicidal self‐injurious behavior (NSSI) and impulsive tendencies. However, self‐injurers have not been shown to be different from comparison groups on laboratory tasks putatively assessing impulsive behavior. One explanation for these contradictory findings is that self‐report and laboratory measures of impulsive behavior tap into distinct but related constructs. Moreover, performance on laboratory measures of impulsive behavior can be influenced by myriad contextual and affective factors not present during past self‐reported NSSI events. Accordingly, a relationship between behavioral tasks of impulsivity and self‐injurious behavior could emerge if both are assessed relatively close in time under controlled laboratory conditions. To test this possibility, both self‐ratings and laboratory task measures of self‐injurious and …