An informant is a person who provides privileged information to an agency.

Informant may also refer to:

Informant (linguistics), a native speaker who provides information about their language for linguistics study Informant (psychiatry), a third party who can report on a psychiatric case for a doctor Informant (statistics), the gradient of the log-likelihood function, also known as the score (function).

See also Informer (disambiguation) The Informant (disambiguation)