Military sexual trauma is a strong predictor of psychiatric disorders and negative health outcomes among military personnel and veterans, but little is known about its relationship with suicide risk. The current study investigates the association of military sexual trauma with suicide risk among 464 U.S. military personnel and veterans enrolled in college classes. Results indicate that premilitary sexual assault was associated with significantly increased risk for later suicide ideation, plans, and attempts during military service. Unwanted sexual experiences occurring during military service was associated with significantly increased risk for suicide ideation and suicide plans for male participants. When considered simultaneously, premilitary sexual trauma showed relatively stronger associations with suicide risk among women whereas military sexual trauma showed relatively stronger associations with suicide risk among men. Results suggest differences in the relation of sexual trauma to suicide risk among male and female military personnel and veterans.