Agonist (from Ancient Greek ἀγωνιστής: agōnistēs, “combatant, champion”) may refer to: A person engaged in a contest or struggle (see agon) An advocate of the political theory of agonism (or "agonistic pluralism") Agonist, a substance that binds to a receptor to induce a biochemical response Inverse agonist, a substance that induces the opposite effect of an agonist Agonist (muscle), a muscle type The Agonist, a Canadian metal band Agonistic behaviour, animal behaviour relating to conflict See also Agonistes (fictional character), a fictional demon from the videogame Tortured Souls Samson Agonistes, a tragic closet drama John Milton Sweeney Agonistes, a verse drama by T.S. Eliot Agonist-antagonist (pharmacology) Combatant Agon (disambiguation) Antagonist (disambiguation) Protagonist (disambiguation) Champion (disambiguation)