Name
- Clevland, John, junior, afterwards MP for Barnstaple1
- Clinton, John, 4th son of Henry, 2nd Duke of Newcastle1
- Cockayne, George, Count Cockayne de Hatley, Colonel of the Crown Dragoons of Poland1
- Coke, Edward, of Add MS 330851
- Coke, John, of Add MS 330851
- Colville, Alexander, 17th Baron Colville of Culross, Captain, afterwards Admiral1
- Colyear, David, 1st Earl of Portmore1
- Compton, Charles, 3rd son of George, 4th Earl of Northampton; Envoy Extraordinary at Lisbon1
- Conde de Roydeville1
- Conne, G-, English Spy at Paris1
- Conolly, Thomas, MP1
- Cooke, William, of Add MS 331001
- Corry, Isaac, Chancellor of the Exchequer, Ireland1
- Cosne, Ruvigny, Captain; Secretary to the English Embassy in Paris1
- Couraud, John, Under Secretary of State1
- Court, Commander of the French Mediterranean squadron1
- Courtail, John, Fellow of Clare Hall, Cambridge, and Prebendary of Chichester1
- Courteille, Jacques Dominique, French Minister to Switzerland, fl 17481
- Crutta, Andrea1
- Crutta, Giovanni1