» Philosophers
- Menippus
- Merleau-Ponty, Maurice
- Metrocles
- Meyerson, Emile
- Mill, John Stuart
- Mitchell, William
- Moore, George Edward
- Mozi (Mo-tzu)
- Musonius Rufus
- Nagarjuna
- Nancy, Jean-Luc
- Nietzsche, Friedrich
- Nozick, Robert
- Ockham, William of
- Paley, William
- Parmenides
- Pascal, Jacqueline
- Peirce, Charles Sanders
- Philo of Alexandria
- Plato
- Plotinus
- Poincaré, Jules Henri
- Priestley, Joseph
- Prodicus
- Protagoras
- Pseudo-Dionysius the Areopagite
- Pyrrho
- Pythagoras
- Radhakrishnan, Sarvepalli
- Rāmānuja
- Rand, Ayn Alissa
- Rawls, John
- Reichenbach, Hans
- Rescher, Nicholas
- Ricoeur, Paul
- Rorty, Richard
- Ross, William David
- Rousseau, Jean-Jacques
- Roy, M. N.
- Royce, Josiah
- Sablé, Marquise De
- Santayana, George
- Śāntideva
- Schelling, F. W. J. von
- Schopenhauer, Arthur
- Scotus, John Duns
- Sengzhao (Seng-Chao)
- Shaftesbury
- Shpet, Gustav
- Smith, Adam
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