T This study aimed to determine the effect of professionalism, competence and organizational support to the performance of forensic. Factors that were tested are professionalism, competence and organizational support as independent variables, as well as the forensic accountant's performance as the dependent variable. Object and sample of research are forensic accountants at the BPK, BPKP, PPATK, Judiciary and Police with convience sampling technique.The dimension of time that used cross-sectional because data is only collected for a certain time with the aim of describing the environmental conditions of the population and real. The data used are primary data derived from questionnaires and interviews and secondary data sourced from the KPK, ICW, IT report and previous research. Statistical methods using descriptive analysis, test data quality, classic assumption test and multiple linear regression analysis.Simultaneous hypothesis test results show that the professionalism, competence and organizational support has a significant positive influence on the performance of a forensic accountant. For the partial results of the study three independent variables have significant positive influence on the performance of forensic accountant. The coefficient of determination indicates the number of 0,481. This indicates that the variable sof professionalism, competence and organizational support are able to explain the performance of forensic accountants around 48% while the remaining 52% is explained by other factors are not discussed in this study.