Oklahoma State Bureau of Investigation

The Oklahoma State Bureau of Investigation (OSBI) is an independent state law enforcement agency of the government of Oklahoma. The OSBI assists the county sheriff offices and city police departments of the state, and works independent of the Oklahoma Department of Public Safety to investigate criminal law violations within the state at the request of statutory authorized requesters. The OSBI was created in 1925 during the term of Governor Martin E. Trapp.

The OSBI is governed by a seven-member commission, with each member of the commission appointed by the Governor of Oklahoma. The commission then appoints a director, who serves at the pleasure of the commission, as the chief executive officer of the OSBI. The current director is Greg Mashburn and was appointed to serve as Director on March 3, 2025.