The Radical Party was a liberal and libertarian political party in Italy.

Radicalism was a political movement representing the leftward flank of liberalism during the late 18th and early 19th centuries and a precursor to social liberalism, social democracy, civil libertarianism, and modern progressivism. This ideology is commonly referred to as "radicalism" but is sometimes referred to as radical liberalism, or classical radicalism, to distinguish it from radical politics. Its earliest beginnings are to be found during the English Civil War with the Levellers and later the Radical Whigs.