Et can also be a past-tense form of "eat" (used similarly to "ate") used in some parts of eastern and southern USA.

Et, et and ET may also refer to:

Places and geography

• ET, Ethiopian Airlines, IATA airline designator
• ET, the country code for Ethiopia
• et, the Internet country code top-level domain for Ethiopia
• et, ISO 639 alpha-2 language code for Estonian
• Eiffel Tower, a tower in Paris, France
• Eastern Time, both in standard and daylight time; three separate time zones use this name:
• the Australian time zone at UTC+10 or UTC+11
• the Brazilian Eastern time zone at UTC-3 or UTC-2
• the North American time zone at UTC-5 or UTC-4
• Tundra climate, in Köppen climate classification

Science and engineering

• Effective temperature, a measurement for stars
• Elapsed time or end time, denotations in science experiments
• Electron transfer, the process by which an electron moves from one atom or molecule to another
• Electron tomography
• Engineering technology
• Enterostomal therapy
• Equal temperament, a musical temperament, or system of tuning
• Essential tremor, a neurological disorder characterized by shaking of hands
• Ethyl group, a functional group in organic chemistry
• Evapotranspiration, the sum of evaporation and plant transpiration
• Exatesla, an SI unit of magnetic flux density
• Extraterrestrial life
• Space Shuttle external tank, a tank that contains the liquid hydrogen fuel and liquid oxygen oxidizer and supplies them under pressure to the three space shuttle main engines
• Essential thrombocythemia, a chronic blood disorder
• Emissions trading, a flexible mechanism of the Kyoto protocol

Sports

• ET, designation for Andrew Ettingshausen, former Cronulla Sharks, NSW and Australian rugby league player
• Extra time, especially relating to Football (soccer) matches
• elapsed time (e.t.), the time for a dragster to race a set distance

Fiction

• E.T. the Extra-Terrestrial, the 1982 film
• ET (Extra-Terrestrial), a song by OutKast on the album ATLiens

Medicine

• Embryo transfer

Automotive industry

• From the German word Einpresstiefe, translated as insertion depth, the offset of a wheel or rim measured in millimeters (this is a placeholder, see reference http://www.driverstechnology.co.uk/wheel-offset.htm)

Other

• Electronics Technician, a rating in the United States Navy
• Entertainment Today, a TV programme shown on Fridays on GMTV
• Entertainment Tonight, a daily television entertainment news show
• Wolfenstein: Enemy Territory or Enemy Territory: Quake Wars