ET (or et) is Latin for and; it can also refer to:

• Estonian language (ISO 639 alpha-2, et)
• E.T. the Extra-Terrestrial, the 1982 film, or the related video game
• extraterrestrials in general
• Eastern Time, both in standard time and daylight time
• Entertainment Tonight
• engineering technology
• elapsed time or end time
• ethyl
• evapotranspiration
• Tundra climate in Köppen climate classification
• enterostomal therapy
• the top-level domain (ccTLD) for Ethiopia;
• the Space Shuttle external tank; or
• the game Wolfenstein: Enemy Territory.
• the IATA code for Ethiopian Airlines