Name
- Somma, Tommaso di, Marchese di Circello, Neapolitan foreign minister1
- Sontag, John, Lieutenant-General; of Add MS 484131
- Spencer, Henry John, diplomatist1
- Stadion, Johann Philipp Karl Joseph, Count Austrian statesman1
- Stanhope, Charles, 3rd Earl of Harrington1
- Stanislas Augustus, King of Poland1
- Statella, Francesco, Principe di Cassaro; majordomo of the King of Naples1
- Stewart, George, 8th Earl of Galloway, naval officer and politician, 1768-18341
- Stewart, Jane, née Paget; wife of George, 8th Earl of Galloway1
- Strachey, Christopher, Captain; RN1
- Struensee von Karlsbach, Karl August, Prussian Minister of Finance1
- Stuart, Charles, Baron Stuart de Rothesay, diplomatist, 1779-18451
- Sturges-Bourne, William, politician1
- Talbot, James, alias Tindall; diplomatist1
- Taylor, Herbert, Lieutenant-General; GCB; of Add MS 482431
- Thellusson, Peter Isaac, 1st Baron Rendlesham1
- Thomson, Andrew, Lieutenant; RN1
- Thorley, Major; at Naples1
- Thornton, John, of Hamburg1
- Thugut, Johann Amadeus Franz de Paula von, Baron Austrian diplomatist1