Special Investigations Unit (disambiguation)

• CNN Special Investigations Unit
• Halton Regional Police Service
• Multnomah County Sheriff's Office
• New York State Office of Tax Enforcement
• Office of Special Investigations (disambiguation)
• S.I.U. (film)
• SIU (disambiguation)
• Shelburne Police Service
• Special Investigations (disambiguation)
• Special Investigations Bureau (disambiguation)
• Special Investigations Division (disambiguation)
• Special Investigations Unit
• Toronto Police Service
• White House Plumbers