Apt
Apt. is an abbreviation for apartment.  
Apt may also refer to:

Places
Apt Cathedral, a former cathedral, and national monument of France, in the town of Apt in Provence
Apt, Vaucluse, a commune of the Vaucluse département of France
Arrondissement of Apt, an arrondissement in the Vaucluse département of France
Canton of Apt, France
Opatów, a town in Poland, called "Apt" in the Yiddish language

Surname
Jerome Apt (born 1949), Ph.D., an American astronaut
Leonard Apt, inventor of the Apt test
Milburn G. Apt (1924–1956), US test pilot

Arts, entertainment, and media
Apt. (album), a 2006 album by Chilean singer Nicole
Apt. (film), a 2006 South Korean horror film
Apt, a literary journal published by Aforementioned Productions
Apt Pupil, a novella by Stephen King, originally published in the 1982
Apt Pupil (film), a 1998 film based on Stephen King's eponymous novel
Apt Records, a subsidiary record label of ABC-Paramount Records

Other uses
APT (software), a package manager associated with Linux, commonly spelled "apt", in lowercase
Apt (Egyptian), may refer to several deities or to a location in Egypt
Apt (Martian crater)
Apt test, a medical test used to differentiate fetal or neonatal blood from maternal blood
Apt meteorite of 1803, a meteorite which fell in Provence-Alpes-Côte d'Azur, France

See also
APT (disambiguation)
Apartment (disambiguation)