The Office of the Inspector General (OIG) for the United States Department of Justice (DOJ) is responsible for conducting nearly all of the investigations of DOJ employees and programs.

The office has several hundred employees, reporting to the Inspector General.

[1][2] The OIG conducts independent investigations, audits, inspections, and special reviews of United States Department of Justice personnel and programs.

The OIG completes these tasks to detect and deter waste, fraud, abuse, and misconduct, and to promote integrity, economy, efficiency, and effectiveness in Department of Justice operations.

The OIG's investigative jurisdiction includes all allegations of criminal wrongdoing or administrative misconduct by DOJ employees, except for allegations of misconduct that "relate to the exercise of the authority of an attorney to investigate, litigate, or provide legal advice," which are referred to the DOJ Office of Professional Responsibility (OPR) unless the allegation concerns attorneys who work for OPR or the investigation is criminal in nature.