Alt

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

André Leon Talley (1948–2022), fashion journalist, stylist, and creative director
Alt (film), a 2013 Venezuelan 6-minute science-fiction movie

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 Glossary of music terminology § A
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)

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

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

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) (German: Alt), 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

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