Name
- Simmons, John, of Add MS 378751
- Sinclair, G-, Colonel1
- Smith, Caroline, wife of Sir W Sidney Smith1
- Smith, Charles Douglass, Major1
- Smith, Fdward, General1
- Smith, John Spencer, FRS, diplomat, politican and writer, 1769-18451
- Smyth, James Carmichael, physician, 1742-18211
- Solérac, Toussaint Gabriel Gilbert de, Chevalier1
- Spenser, George John, 2nd Earl Spencer1
- St Victor, Marquis de1
- St. John, St. Andrew, Baron St1
- Starhemberg, Ludwig Josef Maria Georg, Count, and (1807) Prince; Imperial Minister in London1
- Steele, Thomas, Secretary of the Treasury (1783-1791)1
- Stevenson, Charles, Colonel; of Add MS 378801
- Stuart, Henry Benedict Maria Clement, Cardinal, Bishop of Tusculum, self-styled Henry IX1
- Stuart, John, General1
- Sutton, Samuel, Captain; of HMS1
- Swinburne, Henry, traveller; of Add MS 378521
- Swinburne, Martha, of Add MS 378491
- Taberna, Vincenzo, Captain1