Office of Special Investigations may refer to:

  • U.S. Air Force Office of Special Investigations
  • Office of Special Investigations (Government Accountability Office)
  • Office of Special Investigations (United States Department of Justice)

See also

  • OSI (disambiguation)
  • Special Investigations Unit (disambiguation)
  • Special Investigations Bureau (disambiguation)
  • Special Investigations Division (disambiguation)
  • Special Investigations Section (disambiguation)
  • Special Investigations (disambiguation)