The mission of the Office of Inspector General (OIG) is to root out corruption, waste, and mismanagement, while promoting effectiveness and efficiency in the City of Chicago. The OIG is a watchdog for the taxpayers of the City, and has jurisdiction to conduct investigations and audits over most aspects of City government.

The OIG Investigations Unit conducts both criminal and administrative investigations into the performance of governmental officers, employees, functions and programs, and may issue subpoenas in furtherance of its investigations. It conducts these investigations either in response to a report from a City employee or other citizen or on the Inspector General’s own initiative to detect misconduct, inefficiency and waste within the programs and operations of City government.