Reference:ICH ICH E6 Guideline R3 (2025) GLOSSARY - Investigator

Document information
Reference	ICH ICH E6 Guideline R3 (2025)
Validity area	ICH
Scope(s)	HM
Document name	ICH E6 Guideline
Version / Revision	R3 (2025)
Status	Current
Document type	International guideline
Language(s)	EN
Description	GUIDELINE FOR GOOD CLINICAL PRACTICE
Official source	Official link
Restricted access	No
Submitted by	Florian Adragna
Contributors

Reference Details
Module	Module 2 — Unit 2.3.1
Scope	G
Document part	GLOSSARY - Investigator
Language	EN
Original entry by	Florian Adragna
Contributors
Tags	Investigator, Definition, Principal investigator

Content

Investigator A person responsible for the conduct of the clinical trial, including the trial participants for whom that person has responsibility during the conduct of the trial. If a trial is conducted by a team of individuals, the investigator is the responsible leader of the team and may be called the principal investigator. Where an investigator/institution is referenced in this guideline, it describes expectations that may be applicable to the investigator and/or the institution in some regions. Where required by the applicable regulatory requirements, the “investigator” should be read as “investigator and/or the institution.”