| Cacogenics | study of racial degeneration (see list of branches of science) |
| Cacophobia | fear of ugliness (see list of phobias) |
| Cainophobia | fear of newness or novelty (see list of phobias) |
| Cainotophobia | fear of newness or novelty (see list of phobias) |
| Caligynephobia | fear of beautiful women (see list of phobias) |
| Caliology | study of bird's nests (see list of branches of science) |
| Calorifics | study of heat (see list of branches of science) |
| Cambistry | science of international exchange (see list of branches of science) |
| Campanology | study of bells (see list of branches of science) |
| Cancerophobia | fear of cancer (see list of phobias) |
| Carcinology | study of crabs and other crustaceans (see list of branches of science) |
| Carcinophobia | fear of cancer (see list of phobias) |
| Cardiology | study of the heart (see list of branches of science) |
| Cardiophobia | fear of the heart (see list of phobias) |
| Caricology | study of sedges (see list of branches of science) |
| Carnophobia | fear of meat (see list of phobias) |
| Carpology | study of fruit (see list of branches of science) |
| Cartography | study of making maps and globes (see list of branches of science) |
| Catacoustics | study of echoes or reflected sounds (see list of branches of science) |
| Catagelophobia | fear of being ridiculed (see list of phobias) |
| Catallactics | study of commercial exchange (see list of branches of science) |
| Catapedaphobia | fear of jumping from high and low places (see list of phobias) |
| Cathisophobia | fear of sitting (see list of phobias) |
| Catoptrophobia | fear of mirrors (see list of phobias) |
| Celestial mechanics | study of motion of objects in outer space (see list of branches of science) |
| Cell biology | study of the different structures and functions of both eukaryote and prokaryote cells (see list of branches of science) |
| Cenophobia | fear of new things or ideas (see list of phobias) |
| Cenotophobia | fear of voids, empty rooms, barren spaces (see list of phobias) |
| Centophobia | fear of new things or ideas. (see list of phobias) |
| Ceraunophobia | fear of thunder and lightning (see list of phobias) |
| Cetology | study of whales and dolphins (see list of branches of science) |
| Chaetophobia | fear of hair (see list of phobias) |
| Chaology | study of chaos or chaos theory (see list of branches of science) |
| Characterology | study of development of character (see list of branches of science) |
| Cheimaphobia | fear of cold (see list of phobias) |
| Cheimatophobia | fear of cold (see list of phobias) |
| Chemistry | study of properties and behaviours of substances (see list of branches of science) |
| Chemophobia | fear of chemicals (see list of phobias) |
| Cherophobia | fear of happiness or gaiety (see list of phobias) |
| Chionology | study of snow (see list of branches of science) |
| Chionophobia | fear of snow (see list of phobias) |
| Chiraptophobia | fear of being touched (see list of phobias) |
| Chirography | study of handwriting or penmanship (see list of branches of science) |
| Chirology | study of the hands (see list of branches of science) |
| Chirophobia | fear of hands (see list of phobias) |
| Chiropody | study of feet (see list of branches of science) |
| Chiroptophobia | fear of bats (see list of phobias) |
| Cholerophobia | fear of anger (see list of phobias) |
| Chorology | study of the geographic description of anything (see list of branches of science) |
| Chorophobia | fear of dancing (see list of phobias) |
| Chrematistics | study of wealth; political economy (see list of branches of science) |
| Chrematophobia | fear of money (see list of phobias) |
| Chromatophobia | fear of colors (see list of phobias) |
| Chrometophobia | fear of money (see list of phobias) |
| Chromophobia | fear of colors (see list of phobias) |
| Chronobiology | study of biological rhythms (see list of branches of science) |
| Chronomentrophobia | fear of clocks (see list of phobias) |
| Chronophobia | fear of time (see list of phobias) |
| Chrysology | study of precious metals (see list of branches of science) |
| Cibophobia | fear of food (see list of phobias) |
| Classical mechanics | study of motion of macroscopic objects (see list of branches of science) |
| Claustrophobia | fear of confined spaces (see list of phobias) |
| Cleisiophobia | fear of being locked in an enclosed place (see list of phobias) |
| Cleithrophobia | fear of being locked in an enclosed place (see list of phobias) |
| Cleptophobia | fear of stealing (see list of phobias) |
| Climacophobia | fear of stairs, climbing, or of falling downstairs (see list of phobias) |
| Climatology | study of climate (see list of branches of science) |
| Clinology | study of aging or individual decline after maturity (see list of branches of science) |
| Clinophobia | fear of going to bed (see list of phobias) |
| Clithrophobia | fear of being locked in an enclosed place (see list of phobias) |
| Cnidophobia | fear of stings (see list of phobias) |
| Codicology | study of manuscripts (see list of branches of science) |
| Coimetrophobia | fear of cemeteries (see list of phobias) |
| Coitophobia | fear of coitus. (see list of phobias) |
| Coleopterology | study of beetles and weevils (see list of branches of science) |
| Cometology | study of comets (see list of branches of science) |
| Cometophobia | fear of comets (see list of phobias) |
| Computer science | study of processes that interact with data (see list of branches of science) |
| Conchology | study of shells (see list of branches of science) |
| Connectomics | study of connectomes (see list of branches of science) |
| Consecotaleophobia | fear of chopsticks (see list of phobias) |
| Contact mechanics | study of the deformation of solids that touch each other (see list of branches of science) |
| Contreltophobia | fear of sexual abuse (see list of phobias) |
| Coprastasophobia | fear of constipation (see list of phobias) |
| Coprology | study of feces (see list of branches of science) |
| Coprophobia | fear of feces or defecation (see list of phobias) |
| Cosmetology | study of cosmetics (see list of branches of science) |
| Cosmochemistry | study of the chemical composition of matter in the universe and the processes that led to those compositions (see list of branches of science) |
| Cosmology | study of the universe (see list of branches of science) |
| Coulrophobia | fear of clowns (see list of phobias) |
| Counterphobia | fear of not being in fearful situations (see list of phobias) |
| Craniology | study of the skull (see list of branches of science) |
| Cremnophobia | fear of precipices or steep cliffs (see list of phobias) |
| Criminology | study of crime and criminals (see list of branches of science) |
| Cryobiology | study of life under cold conditions (see list of branches of science) |
| Cryophobia | fear of extreme cold, ice or frost (see list of phobias) |
| Cryptology | study of codes (see list of branches of science) |
| Cryptozoology | study of animals for whose existence there is no conclusive proof (see list of branches of science) |
| Crystallophobia | fear of crystals or glass (see list of phobias) |
| Ctetology | study of the inheritance of acquired characteristics (see list of branches of science) |
| Cyberphobia | fear of computers or working on a computer (see list of phobias) |
| Cyclonology | study of tropical cyclones, e.g. hurricanes (see list of branches of science) |
| Cyclophobia | fear of bicycles (see list of phobias) |
| Cymophobia | fear of waves or wave like motions (see list of phobias) |
| Cynology | study of dogs (see list of branches of science) |
| Cynophobia | fear of dogs or rabies (see list of phobias) |
| Cyprianophobia | fear of prostitutes or venereal disease (see list of phobias) |
| Cypridophobia | fear of prostitutes or venereal disease (see list of phobias) |
| Cyprinophobia | fear of prostitutes or venereal disease (see list of phobias) |
| Cypriphobia | fear of prostitutes or venereal disease (see list of phobias) |
| Cytology | study of living cells (see list of branches of science) |
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