- Cities and towns, Ancient1
- City planning2
- Civil law10
- Civil procedure1
- Civil procedure (Islamic law)1
- Civil service--Examinations1
- Civilization1
- Civilization--Islamic influences1
- Civilization--Jewish influences1
- Clare, of Assisi, Saint, 1194-12533
- Clasps21
- Classical biography1
- Classical dictionaries1
- Classical literature4
- Classification3
- Classification of sciences15
- Clement VI, Pope, approximately 1291-13521
- Clement VII, Pope, 1478-15341
- Clement VIII, Pope, 1536-16051
- Clementinae constitutiones (Catholic Church)2