The Siak District Prosecutor's Office is a government agency that exercises state power in the field of prosecution and other powers based on law no. 16 of 2004 concerning the RI Attorney General's Office, which has a jurisdiction in the Siak area.

The Siak State Prosecutor's Office (Kejari Siak) is structurally located under the Riau High Prosecutor's Office and the Indonesian Attorney General's Office in the capital city, the Siak Prosecutor's office is located at Jalan Sultan Syarif Qosim No.46, Kp. Dalam, Mempura, Siak Regency, Riau 28773.

Responding to public demands for the performance of the Attorney General's Office, the Republic of Indonesia Prosecutor's Office is currently working on Bureaucratic Reform in its institution, namely by focusing on accelerating and optimizing case handling, implementing information technology systems in case handling, implementing Information Technology systems for online legal services and redesigning the Attorney's website.

Responding to demands for bureaucratic reform and Public Information Openness, the Siak District Prosecutor's Office attempted to respond to these demands by launching HALO JAKSA SIAK. Through HALO JAKSA SIAK, the Attorney General's Office of Siak tries to provide information and data that supports the achievement of legal development goals that are being pursued by all levels of prosecutors throughout Indonesia, so that the public can access data about the legal and statutory basis, the performance of the Siak District Attorney General's Office, reports The latest news about the AGO and case information, HALO JAKSA SIAK also provides a space for anyone who wants to participate directly by providing input and suggestions for improvement of the Prosecutor's Office, especially the Siak District Attorney, including complaints or reports about suspected corruption in the Siak area.