Studies indicate that Prolonged Grief Disorder (PGD) affects approximately 10% of bereaved individuals. Although this represents a minority, accurate identification through reliable instruments enables effective interventions. This study evaluated the psychometric properties of the PGD Scale Revised (PG-13-R), a 13-item self-administered measure, in the Brazilian context with 516 participants. The validation process included Exploratory Factor Analysis (EFA; n = 251) and Confirmatory Factor Analysis (CFA; n> = 265). The EFA confirmed the unidimensional structure, retaining all 10 symptom items (KMO = 0.916, Bartlett's test 2 = 1264.196, p < .001, df = 45; 56.36% variance explained; Cronbach's alpha = 0.917). The CFA supported the model with adequate fit indices. Predictive validity was also demonstrated, with higher PG-13-R scores significantly associated with lower WHO-5 scores. These findings suggest the Brazilian version of the PG-13-R is a reliable and valid tool for assessing PGD symptoms in both clinical and research contexts.