This study aims to analyze the roles and functions of the Financial Services Authority (OJK) in the financial system in Indonesia. The research method used is juridical normative with a statutory approach. The results show that the OJK is an institution that carries out regulatory and supervisory tasks on the following activities: 1) Financial services activities in the banking sector, 2) Financial services activities in the Capital Markets sector, 3) Financial services activities in the Insurance sector, Pension Funds, Institutions Financing, and Other Financial Service Institutions. To carry out regulatory and supervisory duties. The roles and functions of the OJK can be seen based on the authority of the OJK as follows: 1) Supervision and Regulation of Bank Financial Institutions, 2) Regulation of financial services institutions (bank and non-bank) including, 3) Supervision of financial institutions (banks and non-banks), 4) Investigation of banking crimes.