| Caird, Edward (3) |
| Cajetan, Tommaso de Vio@ (4) |
| Campanella, Tommaso (11) |
| Camus, Albert@ (19) |
| Cano, Melchior (1) |
| Carnap, Rudolf (7) |
| Carneades (4) |
| Cassirer, Ernst (5) |
| Castaneda, Hector-Neri (2) |
| Castoriadis, Cornelius (7) |
| Cato the Elder@ (2) |
| Cavendish, Margaret Lucas@ (12) |
| Cesalpino, Andrea (5) |
| Chalmers, David (10) |
| Charron, Pierre (2) |
| Chartier, Emile (1) |
| Châtelet, Gabrielle Émilie Marquise du (7) |
| Chesterton, G. K.@ (128) |
| Chisholm, Roderick (2) |
| Chomsky, Noam@ (22) |
| Chrucky, Andrew (1) |
| Chrysippus of Soli (1) |
| Chrysoloras, Manuel (3) |
| Chuang Tzu@ (6) |
| Church, Alonzo@ (4) | |
| Churchland, Paul (5) |
| Chwistek, Leon (2) |
| Chyzhevs'kyi, Dmytro (1) |
| Cicero@ (10) |
| Cioran, Emile (1) |
| Cixous, Hélène (4) |
| Clarke, Samuel (7) |
| Cleanthes of Assos (1) |
| Cocchiarella, Nino (2) |
| Cockburn, Catharine Trotter (4) |
| Collingwood, Robin George (3) |
| Comte, Auguste (1) |
| Condillac, Étienne Bonnot de (9) |
| Condorcet, Marquis de (5) |
| Confucius (12) |
| Constant, Benjamin (2) |
| Conway, Anne Finch (3) |
| Copleston, Frederick@ (3) |
| Corbin, Henry (2) |
| Crates of Thebes (3) |
| Critias (3) |
| Croce, Benedetto (4) |
| Cruz, Sor Juana Inés de la (4) |
| Cudworth, Ralph (7) |
| Cumberland, Richard (5) | |
