Adversary (disambiguation)

Adversary may refer to:
* In general, one's adversary is someone whose purposes are opposed to, or conflict with, one's own purposes
* Adversary (cryptography), in cryptography, a malicious entity whose aim is to prevent the users of the cryptosystem from achieving their goal
* In computer algorithms, an adversary is a theoretical agent that uses information about the past moves of an on-line algorithm to choose inputs that force the worst-case cost of the algorithm.
* In religious contexts, Adversary may refer to the Devil.
* The Adversarial process is used to resolve disputes
* The Adversarial system is used in legal processes
* The Adversary proceeding is used in bankruptcy processes
* The Adversarial review is used as a part of the scientific process

Relating to popular culture:
*Adversary (band), a metal band from Århus, Denmark
*Adversary (band), a metal band from Chicago, USA
*Ad·ver·sary, an industrial band from Ottawa, Canada
*The Adversary is the main villain in Fables
*Adversary (comics), a villain from the Marvel comics universe
The Adversary (DS9 episode), the season finale of Star Trek: Deep Space Nine's third season