Prior research has identified a negative association between suicidal ideation and help-seeking, a phenomenon called "help-negation." Help-negation has been documented to occur for both professional and nonprofessional sources of help. In this study help-seeking attitudes, stigma concerns, and perceptions of social support were examined as possible mediators of help-negation. Data were collected from a nonclinical sample of college undergraduates at a midwestern university (N = 321). Findings provided partial support for the mediation hypotheses. Help-seeking attitudes and stigma were significant predictors of help-seeking intentions ([beta] = 0.34 and [beta] = -0.17, p less than 0.05, respectively), but did not mediate help-negation for professional sources. Perceptions of social support, on the other hand, fully mediated help-negation for nonprofessional sources ([beta] = 0.27, p less than 0.05).