Friedrich Wilhelm Christian Karl Ferdinand von Humboldt (22 June 1767 – 8 April 1835) was a Prussian philosopher, linguist, government functionary, diplomat, and founder of the Humboldt University of Berlin. In 1949, the university was named after him and his younger brother, Alexander von Humboldt, a naturalist.

He was a linguist who made contributions to the philosophy of language, ethnolinguistics, and to the theory and practice of education. He made a major contribution to the development of liberalism by envisioning education as a means of realizing individual possibility rather than a way of drilling traditional ideas into youth to suit them for an already established occupation or social role. In particular, he was the architect of the Humboldtian education ideal, which was used from the beginning in Prussia as a model for its system of public education, as well as in the United States and Japan. He was elected as a member of the American Philosophical Society in 1822.

Humboldt was born in Potsdam, Margraviate of Brandenburg, and died in Tegel, Province of Brandenburg.

His father, Alexander Georg von Humboldt (1720–1779), belonged to a prominent German noble family from Pomerania. Although not one of the titled gentry, he was a major in the Prussian Army, who had served with the Duke of Brunswick. At age 42, Alexander Georg was rewarded for his services in the Seven Years' War with the post of royal chamberlain. He profited from the contract to lease state lotteries and tobacco sales.

Wilhelm's grandfather was Johann Paul von Humboldt (1684–1740), who married Sophia Dorothea von Schweder (1688–1749), daughter of Prussian General Adjutant Michael von Schweder (1663–1729). In 1766, his father, Alexander Georg married Maria Elisabeth Colomb, a well-educated woman and widow of Baron Friedrich Ernst von Holwede (1723–1765), with whom she had a son Heinrich Friedrich Ludwig Ferdinand (1762–1817). Alexander Georg and Maria Elisabeth had four children: two daughters, Karoline and Gabriele, who died young, and then two sons, Wilhelm and Alexander. Her first-born son Heinrich, Wilhelm and Alexander's half-brother, Rittmaster in the Gendarme regiment was something of a ne'er do well, not often mentioned in the family history.

In June 1791, Humboldt married Caroline von Dacheröden. They had eight children, of whom five (amongst them Gabriele von Humboldt) survived to adulthood.

Humboldt was a philosopher; he wrote The Limits of State Action in 1791–1792 (though it was not published until 1850, after Humboldt's death), one of the boldest defences of the liberties of the Enlightenment. It influenced John Stuart Mill's essay On Liberty through which von Humboldt's ideas became known in the English-speaking world. Humboldt outlined an early version of what Mill would later call the "harm principle". His house in Rome became a cultural hub, run by Caroline von Humboldt.

The section dealing with education was published in the December 1792 issue of the Berlinische Monatsschrift under the title "On public state education". With this publication, Humboldt took part in the philosophical debate regarding the direction of national education that was in progress in Germany, as elsewhere, after the French Revolution.^{[citation needed]}