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- John A. O'Brien Professor of Philosophy
- : Department of Philosophy
- : Philosophy
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- O'Neill Family Professor of Philosophy
- : Department of Philosophy
- : Philosophy
- Logic and Philosophy of Logic, Logical Consequence and Entailment, Nonclassical Logics, Paradoxes, Philosophy of Religion, Logical Pluralism, Logical Semantics and Logical Truth, 20th Century Logic, History of Logic, Misc, Philosophy of Language
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- R.L. Canala College Professor of Philosophy
- : Department of Philosophy
- : Philosophy
- Metaphysics, Counterfactual Theories of Causation, Theories of Causation, Causation in the Law, Time Travel, Intersectionality
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- McMahon-Hank Professor of Philosophy
- : Department of Philosophy
- : Philosophy
- Logic and Philosophy of Logic, Philosophy of Mathematics, Philosophy of Language, Miscellaneous, 20th Century Analytic Philosophy
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- Assistant Teaching Professor; Director, Sheedy Family Program In Economy, Enterprise, and Society
- : Department of Philosophy
- : Philosophy
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- Assistant Professor
- : Keough School of Global Affairs
- : Peace and Conflict Studies
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- Assistant Professor
- : Department of Philosophy
- : Philosophy
- Epistemology, Value Theory, Meta-Ethics
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- Assistant Teaching Professor; Philosophy As A Way of Life Project Program Coordinator
- : Department of Philosophy
- : Philosophy
- Philosophy of Mind
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- John and Jean Oesterle Associate Professor of Thomistic Studies
- : Department of Philosophy
- : Philosophy
- Medieval and Renaissance Philosophy
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- Rev. John A. O'Brien Professor of Philosophy
- : Department of Philosophy
- : Philosophy
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- Associate Professor
- : Department of Philosophy
- : Philosophy
- Philosophy of Mind, Metaphysics
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- Associate Professor of The Practice
- : Department of Philosophy
- : Philosophy
- Ancient Greek and Roman Philosophy, 17th/18th Century Philosophy, Medieval and Renaissance Philosophy
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- O'Hara Professor of Philosophy and Mathematics
- : Department of Philosophy
- : Philosophy
- Mathematical Logic, The Infinite, Logic and Philosophy of Logic, Set Theory, Philosophy of Mathematics, Hypercomputation, Theory of Computation, Modal Logic
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- Professor
- : Department of Philosophy
- : Philosophy
- Science, Logic, and Mathematics, History of Western Philosophy, Philosophy, Misc
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- Associate Professor of The Practice
- : Department of Philosophy
- : Philosophy
- Søren Kierkegaard, Social and Political Philosophy, History of Political Philosophy, Philosophy of Love
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- Rev. John A. O'Brien Associate Professor
- : Department of Philosophy
- : Philosophy
- Ancient Greek and Roman Philosophy
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- Associate Professor
- : Department of Philosophy
- : Philosophy
- Philosophy of Cognitive Science, 17th/18th Century Philosophy, European Philosophy
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- William J. and Dorothy K. O'Neill Professor of Philosophy
- : Department of Philosophy
- : Philosophy
- 20th Century Philosophy, Metaphysics
