Name
- Kamarovsky, Count1
- Kankrin, Catherine, wife of Count Igor Frantsovich Kankrin1
- Kankrin, Igor Frantsovich, Count, Russian Minister of Finance1
- King, Rufus, United States Senator; Minister to Britain, 1755-18271
- King, Thomas, Secretary, Marine Society1
- Kinneir, John, Knight, army officer, traveller and diplomat, 1782-18301
- Kleinmichel, Petr Andreevich, Count, Russian general1
- Koch, Johann Daniel, of Hamburg1
- Kulibin, Ivan Fedorovich?, of the Hermitage Museum1
- Labenski, Frantz Ivanovich, of the Hermitage Museum1
- Lawrence, William Beach, US diplomatist and jurist1
- Leardi, Paolo, Archbishop of Ephesus; Apostolic Nuncio to Austria1
- Ledebour, Carl Friedrich, botanist, of Dorpat1
- Leiningen, Prince of, of Add MS 472941
- Levashov, Vasily Vasilievich, Russian general1
- Levin, Karl1
- Liddell, Thomas Henry, 1st Baron Ravensworth1
- Lieven, Christoph Heinrich, Prince, Russian diplomatist1
- Lomonosov, Sergei Grigorovich, Russian diplomatist1
- Longinov, Nikolai Mikhailovich, Russian statesman1