Sir Larry Alan Siedentop CBE (24 May 1936 – 13 June 2024) was an American-born British political philosopher with a special interest in 19th-century French liberalism.

He then received, as a Marshall Scholar, a Doctor of Philosophy degree from the University of Oxford for a thesis on the thought of Joseph de Maistre and Maine de Biran, written at Magdalen College, Oxford, under the supervision of Isaiah Berlin.

After retiring from Oxford, Siedentop was a visiting fellow at the Netherlands Institute for Advanced Study in Wassenaar, Queen Victoria Eugenia Professor at the Complutense University of Madrid and a visiting fellow in Philosophy and Public Affairs at the University of St Andrews.

[3] Siedentop's third book, Inventing the Individual: The Origins of Western Liberalism (2014), was praised by both The Wall Street Journal for "attempting to trace a lost genealogy" of "modern secularism, and its freedoms, as Christianity's gift to human society",[4] and by The Guardian as "A remarkable book that will change the way you think about our concept of ourselves.

"[5] In his lifelong work on French political liberalism, Samuel Moyn reflects in the Boston Review that Siedentop, "in making the case for modern liberty," focuses on "nineteenth-century French thinkers such as Benjamin Constant, François Guizot, and Alexis de Tocqueville" who "cast liberal values such as individual freedom as complex social achievements won over long periods, to be treasured and fostered precisely because they reflect collective advancement, not merely moral truth" and which "suggests that history and experience are central to" his "story about how we came to defend liberal values, through what institutions and practices.