ETD may refer to: Science and technology Eustachian tube dysfunction, a disorder of the middle ear Everhart–Thornley detector Explosives trace detector or explosive trace detection Eye-tracking device, an experiment on the International Space Station Electron-transfer dissociation End-of-train device Businesses and organizations Club of Four (French: ), an alliance of French truck manufacturers Estuary Transit District, an American transit operator ICAO designator for Etihad Airways, an Emirati airline Exoplanet Transit Database, a database of exoplanet transit observations Etadunna Airstrip, IATA airport code "ETD" Other uses Electronic Theses and Dissertations, a term used by librarians for a class of institutional repository item Estimated time of departure Exchange-traded derivative contract, a financial instrument Spyro: Enter the Dragonfly, a 2002 platform video game