The aim of this study was the design and validation of a Psychosocial Trauma Scale (PSTS). This instrument tried to capture the following theoretical dimensions: Pre-traumatic Situation, Destruction of Fundamental Beliefs; Intergroup Emotions, and Family and Community Destruction. In a first phase, we gather evidence for the items designed through content validation with experts. In a second phase, we explore the structure with EFA, reducing the number of items. The last phase was a divergent validation, applying the short version of PSTS with other validation scales (symptomatology of post-traumatic stress, psychological well-being, and social well-being). METHOD. A cross-sectional study was conducted, consisting of 382 individuals affected by political violence: civil war in El Salvador, forced displacement from Colombia, and victims of state violence from Chile. RESULTS. The content validation utilized 81 forms with 146 original items. Exploratory factor analysis showed that the PSTS had an internal structure partially differing from the one proposed, with two new emerging dimensions: Destruction of Sociality and Personal and Collective Self-Efficacy. The four dimensions found for PSTS were Pre-traumatic Situation, Destruction of Sociality, Personal and Collective Self-Efficacy and Intergroup Emotions. To examine divergent validity, we correlated these dimensions by using three different instruments, which showed coherent results. DISCUSSION. The dimensions of psychosocial trauma would complement PTSD or clinical measures. Future studies should expand and broaden the study of the psychosocial consequences of collective violence together with the properties of the presented instrument.