A kakistocracy (/kækɪˈstɒkrəsi/, /kækɪsˈtɒ-/) is a government run by the worst, least qualified, or most unscrupulous citizens. The word was coined as early as the seventeenth century. Peter Bowler has noted in his book that there is no word for the government run by the best citizens, and that the aristarchy may be the right term, but still, it could conceivably be a kakistocracy disguised as an aristocracy.

The word is derived from two Greek words, kakistos (κάκιστος; worst) and kratos (κράτος; rule), with a literal meaning of government by the worst people.

The earliest use of the word dates to the 17th century, in Paul Gosnold's A sermon Preached at the Publique Fast the ninth day of Aug. 1644 at St. Maries:

Therefore we need not make any scruple of praying against such: against those Sanctimonious Incendiaries, who have fetched fire from heaven to set their Country in combustion, have pretended Religion to raise and maintaine a most wicked rebellion: against those Nero's, who have ripped up the wombe of the mother that bare them, and wounded the breasts that gave them sucke: against those Cannibal's who feed upon the flesh and are drunke with the bloud of their own brethren: against those Catiline's who seeke their private ends in the publicke disturbance, and have set the Kingdome on fire to rost their owne egges: against those tempests of the State, those restlesse spirits who can no longer live, then be stickling and medling; who are stung with a perpetuall itch of changing and innovating, transforming our old Hierarchy into a new Presbytery, and this againe into a newer Independency; and our well-temperd Monarchy into a mad kinde of Kakistocracy. Good Lord!

English author Thomas Love Peacock later used the term in his 1829 novel The Misfortunes of Elphin, in which he explains kakistocracy represents the opposite of aristocracy, as aristos (ἄριστος) means "excellent" in Greek. In his 1838 Memoir on Slavery (which he supported), U.S. Senator William Harper compared kakistocracy to anarchy, and said it had seldom occurred:

Anarchy is not so much the absence of government as the government of the worst—not aristocracy but kakistocracy—a state of things, which to the honor of our nature, has seldom obtained amongst men, and which perhaps was only fully exemplified during the worst times of the French revolution, when that horrid hell burnt with its most horrid flame. In such a state of things, to be accused is to be condemned—to protect the innocent is to be guilty; and what perhaps is the worst effect, even men of better nature, to whom their own deeds are abhorrent, are goaded by terror to be forward and emulous in deeds of guilt and violence.

American poet James Russell Lowell used the term in 1876, in a letter to Joel Benton, writing, "What fills me with doubt and dismay is the degradation of the moral tone. Is it or is it not a result of Democracy? Is ours a 'government of the people by the people for the people,' or a Kakistocracy rather, for the benefit of knaves at the cost of fools?"

The term is generally used by critics of a country's government. It has been variously used in the past to describe the Russian government under Boris Yeltsin and later Vladimir Putin, the government of Egypt under Abdel Fattah Al-Sisi, governments in sub-Saharan Africa, the government of the Philippines under Rodrigo Duterte, and several United States presidential administrations. The term saw increased usage during the presidency of Donald Trump, going viral when MSNBC host Joy Reid and former CIA Director John Brennan used it to insult Trump in 2017 and 2018 respectively. The word was used by commentators in numerous newspapers, political publications, and books to describe the Trump administration.

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• The dictionary definition of kakistocracy at Wiktionary