Investigator
- Clinical investigator
- Detective
- Ghost hunting
- HMS Investigator
- HMS Investigator (1801)
- Inspector
- Investigation (disambiguation)
- Investigator (magazine)
- Investigator Group
- Investigator Group (disambiguation)
- Investigator Marine Park
- Investigator Strait
- Matthew Flinders
- Missionary (LDS Church)
- New investigator
- Principal investigator
- Private investigator
- Psychic detective
- RV Investigator
- The Investigator
- The Investigator (TV pilot)
- The Investigators (disambiguation)