Pettit defends a version of civic republicanism in political philosophy. His book Republicanism: A Theory of Freedom and Government provided the underlying justification for political reforms in Spain under José Luis Rodríguez Zapatero.[7] Pettit detailed his relationship with Zapatero in his A Political Philosophy in Public Life: Civic Republicanism in Zapatero's Spain, co-authored with José Luis Martí.[8]
Pettit holds that the lessons learned when thinking about problems in one area of philosophy often constitute ready-made solutions to problems faced in completely different areas. Views he defends in philosophy of mind give rise to the solutions he offers to problems in metaphysics about the nature of free will, and to problems in the philosophy of the social sciences, and these in turn give rise to the solutions he provides to problems in moral philosophy and political philosophy. His corpus as a whole was the subject of a series of critical essays published in Common Minds: Themes from the Philosophy of Philip Pettit (Oxford University Press, 2007).[9]
Mind, Morality, and Explanation: Selected Collaborations (with Frank Jackson and Michael Smith) (Oxford University Press, 2004)
Made with Words: Hobbes on Language, Mind, and Politics (2007)[18]
"Joining the Dots" in Common Minds: Themes from the Philosophy of Philip Pettit (2007) edited by Geoffrey Brennan, Robert E. Goodin, Frank Jackson and Michael Smith
A Political Philosophy in Public Life: Civic Republicanism in Zapatero's Spain (2010) with José Luis Martí
Group Agency: The Possibility, Design, and Status of Corporate Agents. (2011) with Christian List
On The People's Terms: A Republican Theory and Model of Democracy. (2012)
Just Freedom: A Moral Compass for a Complex World. (2015)
The Robust Demands of the Good: Ethics with Attachment, Virtue, and Respect. (2015)
The State (2023)
Chapters in books
Pettit, Philip (2004), "The common good", in Dowding, Keith; Pateman, Carole; Goodin, Robert E. (eds.), Justice and democracy: essays for Brian Barry, Cambridge New York: Cambridge University Press, pp. 25–39, ISBN9780521836951.
Pettit, Philip (2009), "Freedom in the spirit of Sen", in Morris, Christopher (ed.), Amartya Sen, Cambridge New York: Cambridge University Press, pp. 91–114, ISBN9780521618069
Dimova-Cookson, Maria (2012), "Republicanism, philosophy of freedom, and the history of ideas: an interview with Philip Pettit.", in Browning, Gary; Dimova-Cookson, Maria; Prokhovnik, Raia (eds.), Dialogues with contemporary political theorists, Houndsmill, Basingstoke, Hampshire New York: Palgrave Macmillan, pp. 155–169, ISBN9780230303058