Agent most commonly refers to: an entity that is capable of action one who acts for, or in the place of another, (the principal), by authority from him a title or honorific, such as "Agent Smith"

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In espionage and law enforcement

• Agent provocateur, person employed by the police or other entity to act undercover to entice or provoke another person to commit an illegal act
• Double agent, counterintelligence term for someone who pretends to spy on a target organization on behalf of a controlling organization, but in fact is loyal to the target organization
• * Triple agent, pretends to be a double agent for the target organization, but in fact is working for the controlling organization all along
• Special agent, title for a detective or investigator for a state, county, municipal, federal or tribal government
• Secret agent, spy involved in espionage

In law

• Agent (law), in Commercial Law, is a person who is authorised to act on behalf of another (called the Principal) to create a legal relationship with a Third Party
• * Election agent, person legally responsible for the conduct of a candidate's political campaign (UK)
• * Free agent, sports player whose contract with a team has expired
• * Literary agent, person who represents writers and their written works to publishers, theatrical producers and film producers
• * Press agent, professional publicist who acts on behalf of his or her client on all matters involving public relations
• * Sports agent, person who procures and negotiates employment and endorsement deals for a player
• * Talent agent or booking agent, person who finds jobs for actors, musicians and models, etc., in various entertainment businesses
• * Foreign agent, person representing the interests of foreign powers, mandated by the Foreign Agents Registration Act to be identified to the American public
• * Patent agent or patent attorney, person who has the specialized qualifications necessary for representing clients in obtaining patents and acting in all matters and procedures relating to patent law and practice
• * Real estate agent or real estate broker, person who acts as an intermediary between sellers and buyers of real estate
• * Travel agent, person who works on behalf of a travel agency
• * Tuition agent, person who works on behalf of a tuition agency, specializing in introducing tutors to students requiring help in the academic area
• * Yacht agent or yacht broker, specialist who acts as a representative for the sale of a yacht or boat

In economics

• Agent (economics), actor and decision maker in a model
• * Homo economicus, concept in some economic theories of humans as rational and broadly self-interested actors
• Agent-Based Computational Economics, computational study of economic processes modeled as dynamic systems of interacting agents
• Rational agent, entity which has clear preferences, models uncertainty via expected values, and always chooses to perform the action that results in the optimal outcome for itself from among all feasible actions
• Representative agent, refers to the typical decision-maker of a certain type

In science

In medicine

• A pharmacological agent is a chemical substance with pharmacological or biological activity, i.e., a pharmaceutical drug

In chemistry and warfare

• Agent Orange, code name for an herbicide and defoliant
• Biological agent, infectious disease or toxin that can be used in bioterrorism or biological warfare
• Chemical warfare, involves using the toxic properties of chemical substances as weapons to kill, injure, or incapacitate an enemy
• * Blister agent or vesicant, chemical compound that causes severe skin, eye and mucosal pain and irritation
• * Blood agent or cyanogen agent, chemical compound carried by the blood for distribution throughout the body
• * Incapacitating agent, agent that produces temporary physiological or mental effects, or both, which will render individuals incapable of concerted effort in the performance of their assigned duties
• * Nerve agent or nerve gases, class of phosphorus-containing organic chemicals (organophosphates) that disrupt the mechanism by which nerves transfer messages to organs
• * Pulmonary agent or choking agent, chemical weapon agent designed to impede a victim's ability to breathe
• * Riot control agent, less-lethal lachrymatory agents used for riot control

In linguistics

• Agent (grammar), the participant of a situation that carries out the action in this situation; also the name of the thematic role (also known as the thematic relation)
• Agent noun (or nomen agentis ), word that is derived from another word denoting an action, and that identifies an entity that does that action

In computer science and artificial intelligence

• Agent architecture, blueprint for software agents and intelligent control systems, depicting the arrangement of components
• Agent-based model, computational model for simulating the actions and interactions of autonomous individuals with a view to assessing their effects on the system as a whole
• Intelligent agent, autonomous entity which observes and acts upon an environment and directs its activity towards achieving goals
• Software agent, piece of software that acts for a user or other program in a relationship of agency
• * Forté Agent, email and Usenet news client used on the Windows operating system
• * User agent, the client application used with a particular network protocol

In culture and entertainment

• Agent 47, fictional character and protagonist in the Hitman video-game series.
• Agent 212 , name of a humorous Belgian comic about a large police officer
• Agent (The Matrix ), group of characters in the series
• Agent (video game), currently in development by Rockstar North for the Playstation 3
• The Agent (film), 1922 film featuring Oliver Hardy
• Secret Agent (1936 film), British film directed by Alfred Hitchcock
• Agent , version of The Mole (TV series) that aired in Poland on TVN
• The Agents, superhuman characters in Seven Samurai 20XX

See also

• Bot (disambiguation)
• Personoid
• Robot