| Chenopodium quinoa |
| Chernobyl Nuclear Accident |
| Cherubism |
| Chest Pain |
| Chest Tubes |
| Chest Wall Oscillation |
| Chewing Gum |
| Cheyne-Stokes Respiration |
| Chi-Square Distribution |
| Chiari-Frommel Syndrome |
| Chicken anemia virus |
| Chickenpox |
| Chickenpox Vaccine |
| Chickens |
| Chicory |
| Chief Cells, Gastric |
| Chief Executive Officers, Hospital |
| Chikungunya virus |
| Chilblains |
| Child |
| Child Abuse |
| Child Abuse, Sexual |
| Child Advocacy |
| Child Behavior |
| Child Behavior Disorders |
| Child Care |
| Child Custody |
| Child Day Care Centers |
| Child Development |
| Child Development Disorders, Pervasive |
| Child Guidance |
| Child Guidance Clinics |
| Child Health Services |
| Child Language |
| Child Mortality |
| Child Nutrition |
| Child Nutrition Disorders |
| Child of Impaired Parents |
| Child Psychiatry |
| Child Psychology |
| Child Reactive Disorders |
| Child Rearing |
| Child Welfare |
| Child, Abandoned |
| Child, Exceptional |
| Child, Gifted |
| Child, Hospitalized |
| Child, Institutionalized |
| Child, Preschool |
| Child, Unwanted |
| Chills |
| Chimera |
| Chimerin 1 |
| Chimerin Proteins |
| Chimerism |
| Chin |
| China |
| Chinchilla |
| Chironomidae |
| Chiropractic |
| Chiroptera |
| Chitin |
| Chitin Synthase |
| Chitosan |
| Chive |
| Chlamydia |
| Chlamydia Infections |
| Chlamydia muridarum |
| Chlamydia trachomatis |
| Chlamydiaceae |
| Chlamydiaceae Infections |
| Chlamydiales |
| Chlamydomonas |
| Chlamydomonas reinhardtii |
| Chlamydophila |
| Chlamydophila Infections |
| Chlamydophila pneumoniae |
| Chlamydophila psittaci |
| Chloral Hydrate |
| Chloralose |
| Chlorambucil |
| Chloramphenicol |
| Chloramphenicol O-Acetyltransferase |
| Chloramphenicol Resistance |
| Chloranil |
| Chlorates |
| Chlordan |
| Chlordecone |
| Chlordiazepoxide |
| Chlorella |