Niccolò di Bernardo dei Machiavelli (3 May 1469 – 21 June 1527) was a Florentine diplomat, author, philosopher, and historian who lived during the Italian Renaissance. He is best known for his political treatise The Prince (Il Principe), written around 1513 but not published until 1532, five years after his death. He has often been called the father of modern political philosophy and political science.

For many years he served as a senior official in the Florentine Republic with responsibilities in diplomatic and military affairs. He wrote comedies, carnival songs, and poetry. His personal correspondence is also important to historians and scholars of Italian correspondence. He worked as secretary to the second chancery of the Republic of Florence from 1498 to 1512, when the Medici were out of power.

After his death Machiavelli's name came to evoke unscrupulous acts of the sort he advised most famously in his work, The Prince. He concerned himself with the ways a ruler could succeed in politics, and believed those who flourished engaged in deception, treachery, and violence. He advised rulers to engage in evil when political necessity requires it, at one point stating that successful founders and reformers of governments should be excused for killing other leaders who would oppose them. Machiavelli's Prince has been surrounded by controversy since it was published. Some consider it to be a straightforward description of political reality. Many view The Prince as a manual, teaching would-be tyrants how they should seize and maintain power. Even into recent times, scholars such as Leo Strauss have restated the traditional opinion that Machiavelli was a "teacher of evil".

Even though Machiavelli has become most famous for his work on principalities, scholars also give attention to the exhortations in his other works of political philosophy. The Discourses on Livy (composed c. 1517) has been said to have paved the way for modern republicanism. His works were a major influence on Enlightenment authors who revived interest in classical republicanism, such as Jean-Jacques Rousseau and James Harrington. Machiavelli's philosophical contributions have influenced generations of academics and politicians, with many of them debating the nature of his ideas.

Niccolò Machiavelli was born in Florence, Italy, the third child and first son of attorney Bernardo di Niccolò Machiavelli and his wife, Bartolomea di Stefano Nelli, on 3 May 1469. The Machiavelli family is believed to be descended from the old marquesses of Tuscany and to have produced thirteen Florentine Gonfalonieres of Justice, one of the offices of a group of nine citizens selected by drawing lots every two months and who formed the government, or Signoria; he was never, though, a full citizen of Florence because of the nature of Florentine citizenship in that time even under the republican regime. Not much is known about Machiavelli's early life, thus one of the main sources that historians rely on regarding his experiences exists in his father's diary, found in the 20th century. His family was a huge influence on his life, and it is said that it was his heritage which instilled Machiavelli with his preference for a republican form of government. There isn't much known about Machiavelli's mother as few facts have been found about her life by historians.

Machiavelli was born in a tumultuous era. The Italian city-states, and the families and individuals who ran them could rise and fall suddenly, as popes and the kings of France, Spain, and the Holy Roman Empire waged acquisitive wars for regional influence and control. Political-military alliances continually changed, featuring condottieri (mercenary leaders), who changed sides without warning, and the rise and fall of many short-lived governments.

Machiavelli was taught grammar, rhetoric, and Latin by his teacher, Paolo da Ronciglione. It is unknown whether Machiavelli knew Greek; Florence was at the time one of the centres of Greek scholarship in Europe. In 1494 Florence restored the republic, expelling the Medici family that had ruled Florence for some sixty years.

Shortly after the execution of Savonarola, Machiavelli was appointed to an office of the second chancery, a medieval writing office that put Machiavelli in charge of the production of official Florentine government documents. Shortly thereafter, he was also made the secretary of the Dieci di Libertà e Pace, the Florentine council responsible for diplomacy and warfare. His appointment remains a mystery to scholars as he was a very young man, 29 at the time, with no experience in law or public office.