| Tître | Title | |
| Cacao ou Cacoyer | Cocoa or Cocoa Tree (Natural history) | |
| Californie | California (Geography) | |
| Calvinisme | Calvinism (Ecclesiastical history) | |
| Calvinists | Calvinists (Ecclesiastical history) | |
| Canada | Canada (Geography) | |
| Canadiens, philosophie des | Canadians, Philosophy of the | |
| Canon | Canon | |
| Canon | Canon (Theology) | |
| Capuchon | Cowl (Ecclesiastical history) | |
| Caractère | Character (Ethics) | |
| Caractère des nations | Character of Nations | |
| Caractère des sociétés ou corps particuliers | Character of Societies and Particular Groups | |
| Carême | Lent (Ecclesiastical history) | |
| Carton | Card (Printing) | |
| Case ou Casse d'imprimerie | Printer's Case (Printing) | |
| Caucase | Caucasus (Mythology. Geography) | |
| Cause | Cause (Metaphysics) | |
| Causes finales | Final Causes (Metaphysics) | |
| Celtiberiens | Celtiberians (Geography. History) | |
| Censeurs de livres | Censors of Books (Literature) | |
| Ceuta | Ceuta (Geography) | |
| Chambre royale et syndicale de la Librairie et Imprimerie | Royal and Syndical Office of Publishing and Printing | |
| Chance, Bonheur | Luck, Happiness (Synonyms. Grammar) | |
| Chasteté | Chastity | |
| Chatouillement | Tickling (Physiology) | |
| Chaufournier | Lime Kiln Worker (Mechanical arts) | |
| Chauve-souris, vespertilio | Bat (Natural History) | |
| Chef d'Oeuvre | Masterpiece (Arts. Crafts) | |
| Chien de mer | Dogfish (Natural History. Ichthyology) | |
| Chocolat | Chocolate (Diet) | |
| Chocolat | Chocolate (Domestic economy. Diet) | |
| Chronologique (machine.) | Chronological (machine) (Chronology) | |
| Chymie | Chemistry (Particular physics) | |
| Citoyen | Citizen (Ancient history. Modern history. Public law) | |
| Civilité, Politesse, Affabilité | Civility, Politeness, Affability (Grammar. Ethics) | |
| Clavecin oculaire | Ocular Harpsichord (Music. Optics) | |
| Clergé | Clergy (Ecclesiastical history) | |
| Clergés | Clergies (Jurisprudence) | |
| Climat | Climate (Geography) | |
| Clitoris | Clitoris (Anatomy) | |
| Clocher | Bell Tower (Architecture) | |
| Coins | Quoins (Printing) | |
| Collège [abridged] | College [abridged] (Architecture) | |
| Colon | Colonist (Commerce) | |
| Colonie | Colony (Ancient history. Modern history. Commerce) | |
| Combinaison | Combination (Mathematics) | |
| Comédie | Comedy (Literature) | |
| Commerce | Commerce | |
| Commune | Common (Jurisprudence) | |
| Commune | Common (Jurisprudence) | |
| Commune ou communes | Commune or Commons (Jurisprudence) | |
| Commune renommée | Common Knowledge (Jurisprudence) | |
| Communes | Commons (Modern history) | |
| Compositeur | Typesetter (Printing) | |
| Composition | Typesetting (Printing) | |
| Comprendre | Understand, To (Philosophy) | |
| Congo | Congo (Modern geography. Trade) | |
| Conservation des forces vives | Conservation of Kinetic Energy | |
| Constantinople | Constantinople (Geography. Commerce) | |
| Construction | Construction (Architecture) | |
| Continuité, loi de | Continuity, Law of | |
| Conversation, entretien | Conversation, Discussion (Grammar) | |
| Corde du rouleau | Girths (Printing) | |
| Cordeliers | Grey Friars (Ecclesiastical history) | |
| Correct | Correctness (Literature) | |
| Correcteur d'Imprimerie | Proofreader | |
| Cosmologie | Cosmology (Science of nature. Cosmology) | |
| Coton [abridged] | Cotton [abridged] (Natural history. Botany) | |
| Coucou | Cuckoo (Card Game) | |
| Coucou | Cuckoo (Materia Medica) | |
| Coucou | Cuckoo (Mythology) | |
| Coucou | Cuckoo (Natural History. Ornithology) | |
| Couplets de Presse d'Imprimerie | Hinges of the Printing Press | |
| Courante | Courante (Music. Dance) | |
| Cran | Cran (Art of the tailor) | |
| Crapaud | Toad (Materia Medica) | |
| Crédulité | Credulity | |
| Croire | Believe (Metaphysics) | |
| Croix ou pile | Heads or Tails (Calculus of probabilities) | |
| Cuisine | Cuisine (Mechanical arts) | |
| Culotte | Breeches (Tailoring) | |
