Background: Polyvictimization is associated with posttraumatic stress disorder (PTSD), severe impairment, and re-victimization, including due to intimate partner violence (IPV), but polyvictmization's role in the perpetration of IPV is less clear. Objective: To examine the indirect effect of PTSD and complex PTSD in the relationship between polyvictimization and IPV perpetration. Method: Polyvictims were identified by cluster analysis of self-reported lifetime victimization history data in a random national sample (N = 234) of men at 66 clinical treatment centers for domestic violence perpetrators in Israel. Results: Four subgroups were identified: low exposure to abuse and physical neglect (C1, N = 105), and three polyvictim subgroups characterized by multiple forms of past exposure to neglect and verbal abuse (C2, N = 38), to verbal and physical abuse without neglect (C3, N = 46), or to neglect and both verbal and physical abuse (C4, N = 28). Participants also were characterized as having low exposure to traumatic events across the lifespan (cluster L5, N=156), or high exposure to traumatic events across the lifespan (cluster L6, N=78). Complex PTSD symptoms had an indirect effect in the relationship between membership in the C3 and C4 polyvictimization clusters (β=.45, p<.05, β=.60, p<.05; respectively) and severity of psychological IPV victimization, as well as between C3 polyvictimization cluster membership and severity of psychological IPV perpetration (β=.32, p<.05). In contrast, PTSD symptoms had no indirect effect in any relationship between cluster membership and IPV outcomes. High lifetime trauma exposure also was directly associated with sexual IPV victimization. Conclusions: Complex PTSD may be a mechanism linking polyvictimization to the severity of both IPV victimization and perpetration. Clinical implications are discussed. Efectos indirectos del trastorno de estrés postraumático y el trastorno de estrés postraumático complejo en la relación de la polivictimización con la violencia de pareja y perpetración en hombres en tratamiento obligatorio Antecedentes: La polivictimización (PV) está asociada con el trastorno de estrés postraumático (TEPT), discapacidad grave y revictimización, incluso debido a la violencia de pareja (IPV, en su sigla en inglés), pero el rol de la PV en la perpetración de IPV es menos claro. Objetivos: Examinar el efecto indirecto del TEPT y el TEPT complejo en la relación entre la PV y la perpetración de IPV. Método: las polivíctimas fueron identificadas por análisis de grupos de datos de historial de victimización autoinformado en una muestra nacional aleatoria (N = 234) de hombres que reciben tratamiento en 66 centros clínicos para violencia doméstica en Israel. Resultados: Se identificaron cuatro subgrupos: baja exposición a violencia y negligencia física (C1, N = 105), y tres subgrupos polivictimizados caracterizados por múltiples formas de exposición en el pasado a negligencia y violencia verbal (C2, N = 38), a violencia verbal y física sin negligencia (C3, N = 46), o ex...