Glossary Term

KOL

Key Opinion Leader (KOL) is a highly regarded clinician, researcher, or expert whose views influence clinical practice, prescribing behaviour, and health policy within a therapeutic area.

Illustration representing KOL
Listen to definition
Related terms
MSL MA HCP
Further reading
Definitive Healthcare: What is a KOL? Browse the HEOR resource database

Spotted an error or have a suggestion? Get in touch

Media Kit · Q2 2026

Where should we send it?

Quick details so we can email the kit and follow up if it's a fit. We use this only to talk to you about sponsorship — never sold or shared.

Your details stay with Mirko von Hein. No newsletter sign-ups, no third-party sharing.