| Cacogenics |
Study of racial degeneration |
| Caliology |
Study of bird's nests |
| Calorifics |
Study of heat |
| Cambistry |
Science of international exchange |
| Campanology |
The art of bell ringing |
| Carcinology |
Study of crabs and other crustaceans |
| Cardiology |
Study of the heart |
| Caricology |
Study of sedges |
| Carpology |
Study of fruit |
| Cartography |
The science of making maps and globes |
| Cartophily |
The hobby of collecting cigarette cards |
| Castrametation |
The art of designing a camp |
| Catacoustics |
Science of echoes or reflected sounds |
| Catalactics |
Science of commercial exchange |
| Catechectics |
The art of teaching by question and answer |
| Cetology |
Study of whales and dolphins |
| Chalcography |
The art of engraving on copper or brass |
| Chalcotriptics |
Art of taking rubbings from ornamental brasses |
| Chaology |
The study of chaos or chaos theory |
| Characterology |
Study of development of character |
| Chemistry |
Study of properties of substances |
| Chirocosmetics |
Beautifying the hands; art of manicure |
| Chirography |
Study of handwriting or penmanship |
| Chirology |
Study of the hands |
| Chiropody |
Medical science of feet |
| Chorology |
Science of the geographic description of anything |
| Chrematistics |
The study of wealth; political economy |
| Chronobiology |
Study of biological rhythms |
| Chrysology |
Study of precious metals |
| Ciselure |
The art of chasing metal |
| Climatology |
Study of climate |
| Clinology |
Study of aging or individual decline after maturity |
| Codicology |
Study of manuscripts |
| Coleopterology |
Study of beetles and weevils |
| Cometology |
Study of comets |
| Conchology |
Study of shells |
| Coprology |
Study of pornography |
| Cosmetology |
Study of cosmetics |
| Cosmology |
Study of the universe |
| Craniology |
Study of the skull |
| Criminology |
Study of crime; criminals |
| Cryobiology |
Study of life under cold conditions |
| Cryptology |
Study of codes |
| Cryptozoology |
Study of animals for whose existence there is no conclusive proof |
| Ctetology |
Study of the inheritance of acquired characteristics |
| Cynology |
Scientific study of dogs |
| Cytology |
Study of living cells |