YT

YT may refer to:

* Air Togo (IATA airline designator), airline based in Togo
* Mayotte (ISO 3166-1 alpha-2 code)
* Yukon Territory, Canada
* yottatesla, an SI unit of magnetic flux density equal to 10²⁴ teslas

YT may also refer to:

In literature:
* "Y.T." (short for "Yours Truly"), a major character in "Snow Crash" novel by Neal Stephenson
* Years of the Trees, an ancient era in J.R.R. Tolkien's Middle-earth legendarium

In computing and Internet:
* .yt, country code top-level domain for Mayotte
* yellowTAB, software firm that produced an operating system ZETA
* "Yoot Tower", 1998 computer game
* an abbreviation for the phrase " [are] you there?", commonly used in instant messaging
* YouTube, video hosting website