An adversary is generally considered to be a person, group, or force that opposes and/or strike (attack), attacks. Adversary may also refer to: * Satan ("adversary" in Hebrew), in Judeo-Christian religion

Entertainment

Fiction

* Adversary (comics), villain from the Marvel comics universe * The mysterious antagonist who invaded the homelands in the comic book series ''Fables (comics), Fables''

Music

* Ad·ver·sary, Canadian industrial musician

Law

* Adversarial system, a system of law commonly used in common-law countries * Adversary proceeding, proceeding used in bankruptcy processes

Science

* Adversarial collaboration, a scientific experiment

Computer science

* Adversary (cryptography), a malicious entity in cryptography whose aim is to prevent the users of the cryptosystem from achieving their goal * Adversary model, in online algorithms, used to show competitiveness of randomized algorithms

Other

* Adversarial purchasing, in business strategic management