S.H.I.E.L.D. is an espionage and law-enforcement agency in the Marvel Comics Universe. Created by Stan Lee and Jack Kirby in Strange Tales #135 (Aug. 1965), it often deals with paranormal and superhuman threats.

The acronym originally stood for Supreme Headquarters, International Espionage, Law-Enforcement Division. It was changed in 1991 to Strategic Hazard Intervention Espionage Logistics Directorate.