FAT

FAT may mean:
* Factory acceptance test (see Acceptance test), a software engineering concept
* Far Eastern Air Transport, an airline of the Republic of China on Taiwan
* File Allocation Table, a file system format used by Microsoft operating systems; and others
* Forces Armées Tchadiennes, the Chad armed forces of the government of President Félix Malloum
* Frente Auténtico del Trabajo, a Mexican labor confederation
* Fresno Yosemite International Airport (IATA airport code)
* Fully Automatic Time, automatic-sensored method of recording race times during running events

See also

* Fat, a generic term for a class of lipids in biochemistry
** Fat tissue or adipose tissue
** Fatness or obesity