Callback

Callback may refer to:


 * Callback (comedy), a joke which refers to one previously told
 * Callback (computer programming), callable (i.e. function) that is passed as data and expected to be called by another callable.
 * Callback (telecommunications), the telecommunications event that occurs when the originator of a call is immediately called back in a second call as a response
 * Callback verification, a method for e-mail address verification used in SMTP
 * Web callback, a technology that provides telephone callback for websites
 * "The Callback", an episode of the TV series Smash
 * Callback, in the performing arts, a stage of the audition process