Name
- Oakeley, Richard Banner, of Add MS 461271
- Oersted, Hans Christian, Danish physicist1
- Ogle, Charles, 2nd Baronet, Admiral of the Fleet1
- Ommanney, Erasmus, Rear-Admiral; KCB 19021
- Orlof, Alexis Theodorovich, Count1
- Orléans, Gaston, Comte d'Eu1
- Orléans, Louis Philippe Albert d', Comte de Paris1
- Orr, Andrew, Lord Provost of Glasgow; Knight 18581
- Osborn, Sherard, Rear-Admiral CB, 1822-18751
- Oswell, William Cotton, game hunter1
- Ouseley, Gore, 1st Baronet, diplomat, 1770-1844, http://isni.org/isni/000000... http://viaf.org/viaf/447339621
- Oxholm, Waldemar Tully, General Danish diplomatist1
- Ozersky, Anicetos, Russian scientist1
- Pahlen, Nikolai Petrovich, Count1
- Palgrave, Francis, Knight, archivist and historian, 1788-18611
- Palgrave, William Gifford, diplomat and traveller, 1826-18881
- Palliser, John, geographer1
- Panizzi, Anthony, Knight, librarian at the British Museum, 1797-1879, http://isni.org/isni/000000...1
- Parish, Woodbine, diplomatist1
- Parke, James, Baron Wensleydale1