Investigation
- Background investigation
- Clinical trial
- Congressional investigation
- Criminal investigation
- Criminal investigation department
- Discovery (observation)
- Examination (disambiguation)
- Federal Bureau of Investigation
- Fire investigation
- Forensic science
- Investigate (magazine)
- Investigation (TV channel)
- Investigation (film)
- Investigation Discovery
- Investigational New Drug
- Investigations in Numbers, Data, and Space
- Investigative journalism
- Investigator (disambiguation)
- Kevin MacLeod
- Outbreak Investigation
- Research
- Tax investigation
- Temporal Investigations
- The Investigation
- The Investigation (TV series)
- The Investigation (play)