Auxiliary

Auxiliary may refer to:


 * A backup site or system

In language

 * Auxiliary language (disambiguation)
 * Auxiliary verb

In military and law enforcement

 * Auxiliary police
 * Auxiliaries, civilians or quasi-military personnel who provide support of some kind to a military service
 * Auxiliaries (Roman military)

In religion

 * Auxiliary bishop, in the Roman Catholic Church
 * Auxiliary organization (LDS Church)

In technology

 * Auxiliary input jack and auxiliary cable, generally for audio; frequently associated with mobile device audio
 * Aux-send of a mixing console
 * An auxiliary Port is a common port found on many Cisco routers for CLI access.

Other uses

 * Auxiliary route, also known as "special route", in road transportation
 * An auxiliary route of the Interstate Highway System in the United States
 * Auxiliary ship is a naval vessel designed to operate in support of combat ships and other naval operations
 * Auxiliary (fraternity or sorority)
 * A marching band color guard
 * Auxiliary percussion
 * "Auxiliary", a song by Benjamin Clementine from And I Have Been, 2022