Aux

Aux or AUX may refer to:

Science and technology

 * AUX (company), a Chinese electronics manufacturer
 * Auxiliary connector or AUX jack, typically used for analog audio signals
 * Aux/IAA repressors, related to auxin plant hormones

Computing

 * AUX: (for auxiliary), a DOS text device
 * AUX (CONFIG.SYS directive), changes assignment for AUX: device in DR-DOS
 * A/UX, a Unix operating system by Apple

Other uses

 * Auxiliary (disambiguation) (abbreviation)
 * Aux (TV channel), a Canadian music TV channel
 * Araguaína Airport (IATA airport code), Tocantins, Brazil