John Stuart Mill’s On Liberty is one of the most influential works of political philosophy ever written and a timeless defence of individual freedom. First published in 1859, it explores the proper limits of authority over the individual, championing freedom of thought, expression and action as the foundations of a just and progressive society. Mill argues that open debate, diversity of opinion and personal autonomy are essential to the pursuit of truth and the advancement of civilisation, while warning against the dangers of conformity and the tyranny of the majority. Written with exceptional clarity and intellectual rigour, On Liberty continues to shape discussions on human rights, democracy and civil society. Its enduring insights into the relationship between liberty, responsibility and the common good ensure its place among the most important works of modern political thought.