The Prince is a 16th-century political treatise written by Italian diplomat and political theorist Niccolò Machiavelli in the form of a realistic instruction guide for new princes. As a remarkable general theme, The Prince appears to take it for granted that immoral acts are justified if they can help achieve political glory.

The Prince is sometimes claimed to be one of the first works of modern philosophy, especially modern political philosophy, in which practical effect is taken to be more important than any abstract ideal. Its world view came in direct conflict with the dominant Catholic and scholastic doctrines of the time, particularly those on politics and ethics.