Objective: To examine the role of grit as a mediator of the relationship between student-veteran status and not seeking mental health help. Participants: A diverse and nationally representative sample of students (8,203 women, 4,934 men) from 18 U.S. colleges and universities included in the Understanding Student Distress and Academic Success study was used. Method: Data were analyzed using structural equation modeling to assess associations between military service, grit, and help seeking. Results: Military service was positively associated with both facets of grit: consistency of interests (CI) and perseverance of effort (PE). CI, but not PE, mediated the relationship between military service and never having sought mental health help. Conclusions: These results suggest that grit mediates the relationship between military service and not seeking mental health help. Interventions for student-veterans that emphasize the utility of mental health treatment may be useful to diminish the negative influence of grit on help-seeking.