ETD

• 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

• Club of Four (French: {{lang|fr|Société Européenne de Travaux et de Développement}}), 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"

• 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

{{disambiguation}}