Special Investigations Section or Special Investigation Section may refer to:
- LAPD Special Investigation Section, a tactical detective and stakeout unit of the Los Angeles Police Department
- Special Investigation Section, a Special Investigation Team of the Kanagawa Prefectural Police
- Special Investigation Team (India)
- Special Investigation Section, a unit in the Criminal Investigation Department of the Singapore Police Force
- Assorted criminal investigation units of the following police forces:
- Atlantic City Police Department
- Baltimore Police Department
- Halifax Regional Police
- Indianapolis Metropolitan Police Department
- Las Vegas Metropolitan Police Department
- Miami Police Department
- Miami Gardens Police Department
- Rochester Police Department
- Sarasota County Sheriff's Office
- Tucson Police Department
- Vancouver Police Department
- Metro Vancouver Transit Police
- State bureau of investigation units of the following American state police forces and state agencies: