- Communion of saints in the liturgy1
- Compendium theologicae veritatis (Hugo, Argentinensis)1
- Conceptionists1
- Concini family1
- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Giovanbattista1
- Confessors1
- Confraternitate Sancta Maria Rotunda (Confraternity : Milan, Italy)1
- Confraternities (Canon law)1
- Consanguinity1
- Conscience1
- Conscience, Examination of1
- Conspiracy1
- Constantine XI Palaeologus, Emperor of the East, 1405-14531
- Contracts (Roman law)1
- Contro, Mochata di1
- Contubernium rosae1
- Contucci, Jacopo1
- Convento di S. Maria degli Angeli (Florence, Italy)1