Investigator

Investigator may refer to:

 Clinical investigator, an investigator involved in a medical clinical trial
 Detective, a person who investigates crimes, can be a rank and job in a police department, state or federal employee, or a civilian called a private detective 
 Investigator Strait, a body of water lying between Yorke Peninsula, on the Australian mainland, and Kangaroo Island in South Australia 
 New investigator, a designation for less experienced researchers 
 Principal investigator, the lead scientist for a particular well-defined science project 
 Private investigator (P.I.), a person who does not work for the police or government, but who undertakes investigations as a subcontractor
 UN Special Investigator, a United Nations appointee, charged with investigations or auditing in a specific matter 
 Ghosthunter, one of other paranormal investigators

 See also
 HMS Investigator, name of ships in the Royal Navy