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Callback can mean:

  • Callback (comedy), a joke which refers to one previously told in a set of jokes including both
  • Callback (computer programming), executable code that is passed as a parameter to other code
  • 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
  • Callback procedure, or callback security procedure, a security check against scam attempts, in which an organization - especially a bank, or an accountant company - exchanges telephone calls to ensure the identity of the customer
  • Web callback, a technology that provides telephone callback for websites