Today, forensic accounting is a highly talked about topic all over the world and is the fastest growing area of accounting. The importance of professional forensic accountant cannot be over emphasized, especially to the public sector. The purpose of this study is to examine forensic accounting as a tool for fraud detection and prevention in the public sector organizations with particular reference to Indonesia. Both primary and secondary sources of data were appropriately used. 200 questionnaires were administered to staff of four (4) ministries in Indonesiawhich included into the top 10 of integrity survey of public sectorheld by Corruption Eradication Commission (KPK), along with interviews conducted with those ministries out of which 173 were filled and returned. Tables and simple percentages were used to analyze the data. The statistical tool used to test hypotheses was Analysis Of Variance (ANOVA). Among the findings was that the use of forensic accounting do significantly reduces the occurrence of fraud cases in the public sector. Therefore the use of forensic accountants can help better in detecting and preventing fraud cases in the public sector organizations in Indonesia. (Study in Indonesia Ministry which included as the biggest 10 indicatef by the result of public integrity survey by Indonesia anti-corruption commission).