- Concini, Alessandra Antinori1
- Concini, Arrigo1
- Concini, Bernardo1
- Concini, Lucrezia1
- Conduct of life1
- Confraternitate Sancta Maria Rotunda (Confraternity : Milan, Italy)1
- Confraternities (Canon law)1
- Constitutions1
- Construction industry1
- Corsini, Bartolomeo1
- Cortesi, Girolamo1
- Cosimo II, Grand Duke of Tuscany, 1590-16211
- Cosimo III, Grand-Duke of Tuscany, 1642-17231
- Cosmology1
- Costapellegrina, Giovan Andrea1
- Courts1
- Courts and courtiers1
- Cressida (Fictitious character)1
- Croatia1
- Croatia--Dalmatia1