Special Investigations Unit or Special Investigation Unit may refer to: * Special Investigations Unit (Ontario), a provincial police oversight agency in Canada * ''CNN Special Investigations Unit'', an investigative documentary on CNN * Halton Regional Police Service#Special Investigations Unit, Halton Regional Police Service's Special Investigations Unit * Multnomah County Sheriff's Office#Special Investigations Unit (SIU), Multnomah County Sheriff's Office's Special Investigations Unit * New York State Office of Tax Enforcement#Special Investigations Unit, New York State Office of Tax Enforcement's Special Investigations Unit * S.I.U. (film), ''S.I.U.'' (film), 2011 Korean action film * Shelburne Police Service#The Special Investigations Unit, Shelburne Police Service's Special Investigations Unit * Toronto Police Service#Special Investigations Unit, Toronto Police Service's Special Investigations Unit * White House Plumbers, covert White House Special Investigations Unit during Nixon presidency

See also