Name
- Coloma, Carlos, Spanish Ambassador in London1
- Comberbach, Roger, of Add MS 356391
- Constançon, H-1
- Conway, Edward, Baron Conway, 1st Viscount Conway and Kilulta; Secretary of State1
- Cooper, William Hawman?1
- Cornwallis, Charles, 1st Marquess Cornwallis, army officer and politician, 1738-18051
- Corry, Trevor, British Consul at Danzig1
- Cosne, Ruvigny, Captain; Secretary to the English Embassy in Paris1
- Court of Rome1
- Coussmaker, George, Captain1
- Coutts and Co, bankers, 1692-1
- Coventry, Thomas, 1st Baron Coventry1
- Cozens, J-, Miss1
- Craigie, Charles, correspondent of Sir Robert Murray Keith, fl 17751
- Cranfield, Lionel, 1st Earl of Middlesex, merchant, financier and government minister, 1575-16451
- Craufurd, Alexander, 1st Baronet1
- Craufurd, Charles Gregan, Knight, army officer and politician, 1761-18211
- Cressener, Henrietta1
- Crosbie, John, Viscount Crosbie, 2nd Earl of Glandore (1781)1
- Cross, Samuel Massey1