John Mitchell Barnett (February 23, 1962 – March 9, 2024) was an American whistleblower who was known for his substantiated safety and quality reports to the Federal Aviation Administration (FAA) about Boeing's production of the Boeing 787 Dreamliner. Barnett worked in quality control at Boeing for 32 years, serving for seven as a manager at Boeing South Carolina. Barnett was one of several employees to go public with The New York Times about malpractices beginning in 2019 at Boeing, and was featured in the 2022 Netflix documentary titled Downfall: The Case Against Boeing.