Karl Marx: His Life and Environment, London: Thornton Butterworth; Toronto: Nelson. 5th edition, ed. Henry Hardy, Princeton and Oxford: Princeton University Press, 2013, [1939].
Freedom and its Betrayal: Six Enemies of Human Liberty
Freedom and its Betrayal: Six Enemies of Human Liberty (1952), Henry Hardy (ed.), London: Chatto and Windus; Princeton: Princeton University Press, 2002.
The Hedgehog and the Fox: An Essay on Tolstoy’s View of History
The Hedgehog and the Fox: An Essay on Tolstoy's View of History, London: Weidenfeld and Nicolson; New York: Simon and Schuster. Expanded version of ‘Lev Tolstoy's Historical Scepticism’, Oxford Slavonic Papers, 2, 1951: 17–54. Reprinted in Berlin 2008; 2nd edition, ed. Henry Hardy, Princeton: Princeton University Press, 2013.
The Roots of Romanticism
The Roots of Romanticism (1965), Henry Hardy (ed.), London: Chatto and Windus; Princeton: Princeton University Press; 2nd ed., Princeton: Princeton University Press, 2013 [1999].
Russian Thinkers
Russian Thinkers. London, 1978: Hogarth Press; New York, Viking, 1978.
Concepts and Categories: Philosophical Essays
1978b, Concepts and Categories: Philosophical Essays, Henry Hardy (ed.), London: Hogarth Press; New York: Viking, 1979: Viking; 2nd ed., Princeton: Princeton University Press, 2013.
Against the Current: Essays in the History of Ideas
1979, Against the Current: Essays in the History of Ideas, Henry Hardy (ed.), London: Hogarth Press; New York, 1980: Viking; 2nd ed., Princeton: Princeton University Press, 2013.
Personal Impressions
Personal Impressions. London: Hogarth Press,1980; New York: Viking, 1981; 2nd edition London: Pimlico, 1998.
“A Letter on Human Nature”
“A Letter on Human Nature” (1986), letter to Beata Polanowska-Sygulska, New York Review of Books, 23 September, 26, 2004.
The Crooked Timber of Humanity: Chapters in the History of Ideas
The Crooked Timber of Humanity: Chapters in the History of Ideas, Henry Hardy (ed.), London: John Murray. New York: Knopf, 1991; 2nd ed., Princeton: Princeton University Press, 2013 [1990]. Vico, de Maistre, Romanticism, Relativism
The Sense of Reality: Studies in Ideas and their History
The Sense of Reality: Studies in Ideas and their History, Henry Hardy (ed.), London: Chatto and Windus; New York: Farrar, Straus and Giroux, 1998.
The Proper Study of Mankind: An Anthology of Essays
The Proper Study of Mankind: An Anthology of Essays, Henry Hardy and Roger Hausheer (eds.), London: Chatto and Windus; New York, 1998: Farrar, Straus and Giroux; 2nd ed., London: Vintage, 2013 [1997].
The Power of Ideas
The Power of Ideas, Henry Hardy (ed.), London: Chatto and Windus; Princeton: Princeton University Press; 2nd ed., Princeton: Princeton University Press, 2013 [2000].
Three Critics of the Enlightenment: Vico, Hamann, Herder
Three Critics of the Enlightenment: Vico, Hamann, Herder (1960–65), Henry Hardy (ed.), London: Pimlico; Princeton: Princeton University Press; 2nd ed., Princeton: Princeton University Press, 2013 [2000].
Political Ideas in the Romantic Age: Their Rise and Influence on Modern Thought
Political Ideas in the Romantic Age: Their Rise and Influence on Modern Thought, Henry Hardy (ed.), London: Chatto and Windus; Princeton: Princeton University Press, 2006.
Flourishing: Letters 1928–1946
Flourishing: Letters 1928–1946, Henry Hardy (ed.), London: Chatto and Windus. Published in the USA as Letters 1928–1946, New York: Cambridge University Press. Paperback with UK title, London: Pimlico; Chicago: Trafalgar Square Publishing, 2005.
Enlightening: Letters 1946–1960
Enlightening: Letters 1946–1960, Henry Hardy and Jennifer Holmes (eds.), London: Chatto and Windus, 2009.
Building: Letters 1960–1975
Building: Letters 1960–1975, Henry Hardy and Mark Pottle (eds.), London: Chatto and Windus, 2013.
The Magus of the North: J.G. Hamann and the Origins of Modern Irrationalism
The Magus of the North: J.G. Hamann and the Origins of Modern Irrationalism. London: John Murray, 1993; New York: Farrar, Straus, Giroux, 1994.