Purpose: To examine the associations of self-reported abuse and sexual molestation with self-reported antisocial behavior and suicidal ideation/behavior in a general population of adolescents. Methods: We used a stratified cluster sampling procedure with replacement to sample 4790 students in Washington State public schools in Grades 8, 10, and 12. Students were asked in a self-administered questionnaire whether they had ever been abused by an adult and whether they had ever been sexually molested. They were also asked about antisocial behavior and suicidal ideation and behavior in the past year. We conducted polytomous logistic regressions, controlling for gender and grade, using Software for the Statistical Analysis of Correlated Data (SUDAAN). Results: Reported abuse history was associated with antisocial behavior and with suicidal ideation and behavior. The associations were stronger for abuse and molestation than for nonsexual abuse or molestation alone, and stronger at higher levels of severity (e.g., suicide attempts vs. suicidal thoughts). For example, adjusted odds ratios and 95% confidence intervals (in parentheses) for abuse and molestation were 4.4 (3.1–6.2) for suicidal thoughts, 6.8 (4.4–10.4) for suicide plan, 12.0 (7.9–18.4) for noninjurious suicide attempt, and 47.1 (23.3–95.3) for injurious suicide attempt. For abuse alone, these figures were 2.3 (1.7–3.2), 3.1 (2.1–4.6), 5.1 (3.3–7.8), and 11.8 (4.4–31.9), respectively. Conclusions: Efforts to reduce antisocial behavior and suicidal ideation/behavior in adolescence, particularly early or severe manifestations of the behaviors, should consider the possible role of a history of maltreatment, especially the possibility of sexual abuse.