Alt or ALT may refer to:
Culture and sociology
Alt account, an alternative online identity; when used deceptively, it is known as a sock puppet account Alternate character, in role-playing games Alternative lifestyle, behavior outside the cultural norm Alternative or youth subculture, including "alt fashion" and "alt aesthetics" alt.* hierarchy, the main set of USENET newsgroups that were not distributed by default Alt-right, an abbreviation of alternative right, a loosely connected far-right, white nationalist movement based largely in the United States
Arts and media
André Leon Talley (1948–2022), fashion journalist, stylist, and creative director Alt (film), a 2013 Venezuelan 6-minute science-fiction movie
Music
Alternative rock, a music genre A.L.T. (born 1970), American Chicano rapper ALT (band) (c. 1995), consisting of Andy White, Liam Ó Maonlaí, and Tim Finn ALT (album), 2012, by Van der Graaf Generator ALT (EP), 2015, by Vanna Alt-J (formed 2007), English indie rock band Alt, alt dom, or altered dominant — see In alt, singing in the octave above the treble staff (G5 to F6) ALT, a robotic singer with songs in the Bemani game series including Pop'n Music, Reflec Beat and Jubeat — see Dance Dance Revolution X3 vs. 2ndMix and Music of Dance Dance Revolution (2013–present)
Linguistics and education
Southern Altai language (ISO-639-3 code "alt") Association for Linguistic Typology (founded 1995), a professional society for linguists Assistant Language Teacher, a job role in Japan Association for Learning Technology (founded 1993), a United Kingdom professional body and learned society
Medicine
Alanine aminotransferase, a enzyme of the transaminase family, primarily found in the liver Alternative Lengthening of Telomeres, a mechanism in cellular biology Argon laser trabeculoplasty, a type of glaucoma surgery
Places and transportation
Alt, Greater Manchester, formerly a civil parish of Limehurst Rural District, between Oldham and Ashton-under-Lyne, in Greater Manchester, England River Alt, in Merseyside, England Olt (river) (), a river in Romania Altoona Transportation Center, Pennsylvania, U.S. (Amtrak code ALT) Altrincham station, in Greater Manchester, England (National Rail station code ALT) Altona railway station, in Melbourne, Victoria, Australia Altitude, vertical distance from a reference point Alternate route, a type of highway designation Approach and Landing Tests of the prototype Space Shuttle Enterprise in 1977 Altimeter, short for altitude meter
Engineering, technology, and mathematics
Accelerated life testing, subjecting a product to extreme conditions to evaluate its weaknesses Alternator, a device that converts mechanical energy into alternating current Alt key, a modifier button on a computer keyboard ALT Linux, a set of Russian computer operating systems Alt attribute, the HTML feature for specifying alternative text in a webpage International Conference on Algorithmic Learning Theory, a theoretical computer science meeting Alternating group, a mathematical object related to even permutations
Other uses
Alt (surname) Aboriginal Land Trust, a type of organisation in Australia Altbier, a German style of beer