Name
- Caspers, J-1
- Cassart, Jean1
- Casteele, J- B-, Lieutenant1
- Castello, Manuel Nuñez1
- Castelyn, Antoni1
- Chanclos1
- Changuion, Pierre Jean1
- Charles Emanuel I, of Sardinia1
- Charles VI, Holy Roman Emperor1
- Charles VII, Emperor of Germany1
- Charles, Princes of Nassau-Usingen1
- Childe, J, correspondent of Lord Portland, fl 16931
- Chotek, Rudolph, Count1
- Clarke, Gedney, junior1
- Clarke, Gedney, senior1
- Cloosher,, M- P-, née Hofman van Somer1
- Cnyphausen,, Madame, née de Wedel1
- Colt, William Dutton, diplomatist1
- Commun, -, of the Hague, diplomat and spy, fl 17511
- Constant de Rebecque, David Louis, Lieutenant -General, Baron de Constant de Rebecque1