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 musicianLaw
* Adversarial system, a system of law commonly used in common-law countries * Adversary proceeding, proceeding used in bankruptcy processesScience
* Adversarial collaboration, a scientific experimentComputer 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 algorithmsOther
* Adversarial purchasing, in business strategic managementSee also
* The Adversary (disambiguation) * Opposition (disambiguation) * Enemy {{disambiguation