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A demagogue /ˈdɛməɡɒɡ/ (from Greek δημαγωγός, a popular leader, a leader of a mob, from δῆμος, people, populace, the commons + ἀγωγός leading, leader) or rabble-rouser is a leader who gains popularity in a democracy by exploiting emotions, prejudice, and ignorance to arouse the common people against elites, whipping up the passions of the crowd and shutting down reasoned deliberation. Demagogues overturn established norms of political conduct, or promise or threaten to do so.

Historian Reinhard Luthin defined demagogue thus: "What is a demagogue? He is a politician skilled in oratory, flattery and invective; evasive in discussing vital issues; promising everything to everybody; appealing to the passions rather than the reason of the public; and arousing racial, religious, and class prejudices—a man whose lust for power without recourse to principle leads him to seek to become a master of the masses. He has for centuries practiced his profession of 'man of the people'. He is a product of a political tradition nearly as old as western civilization itself."

Demagogues have appeared in democracies since ancient Athens. They exploit a fundamental weakness in democracy: because ultimate power is held by the people, it is possible for the people to give that power to someone who appeals to the lowest common denominator of a large segment of the population. Demagogues usually advocate immediate, forceful action to address a crisis while accusing moderate and thoughtful opponents of weakness or disloyalty. If elected to high executive office, demagogues typically unravel limits on executive power and attempt to convert their democracy to dictatorship.

History and definition of the word