Al estudiar el proceso de reinserción social de aquellas personas que han recobrado su libertad luego de una condena, un factor significativo está dado por la propia percepción de ser objeto de prejuicio social. Diversos estudios muestran que la presencia de actitudes sociales negativas hacia el ex recluso promueve mayor violencia y la percepción de menores oportunidades de inserción, contribuyendo al mantenimiento del fenómeno delictual. Dada la carencia de instrumentos evaluativos que permitan su operacionalización, es que se propone presentar la construcción y validación del Cuestionario de Percepción de ser Objeto de Prejuicio Social. El mismo evalúa el grado en que los sujetos se autoperciben como objeto de prejuicio, considerando dos fuentes principales: la sociedad y el control social. Con el fin de estudiar sus propiedades psicométricas se administró el cuestionario a una muestra de 160 liberados condicionales entre los 18 y 45 años. Se obtuvieron adecuados indicadores de fiabilidad, validez factorial y poder discriminativo de los ítems. De acuerdo a los resultados del análisis factorial, se evalúan dos dimensiones principales: a) prejuicio social y, b) prejuicio por parte de los organismos de control social. Se discuten los resultados y se presentan aportes de investigaciones realizadas con el instrumento, con sujetos reincidentes y no reincidentes. Palabras clave Reinserción Social, Percepción de ser Objeto de Prejuicio Social, Instrumentos de Evaluación ABSTRACT SOCIAL REINTEGRATION OF PAROLEES: CONTRIBUTIONS TO THE ASSESSMENT OF PERCEIVED SOCIAL PREJUDICE In the study of the process of social reintegration of those who have regained their freedom after a conviction, a significant factor is given by the self-perception of being subject to social prejudice. Various studies show that the presence of negative social attitudes toward former prisoner generates more violence and perceived fewer opportunities insertion, contributing to the maintenance of criminal behavior. Given the lack of assessment instruments to their operation, is proposed to describe the development and validation of the Perception of being Object of Social Prejudice. It evaluates the degree to which individuals perceive themselves as targets of prejudice, considering two main dimensions: society and social control. In order to study the psychometric properties of the questionnaire, it was administered to a sample of 160 parolees between 18 and 45 years old. Appropriate indicators of reliability, factorial validity and discriminative power of the items were obtained. According to the results of the factor analysis, two main dimensions are evaluated: a) social prejudice and, b) prejudice on the part of the agencies of social control. The results obtained are discussed and the contributions of research with recidivists and non recidivists participants using the instrument are presented. Key words Social reintegration, Perception of being object of prejudice, As-