Name
- Nugent, James, General1
- Nugent, Robert, Viscount Clare (1766) and (1776) Earl Nugent1
- Nuthall, Thomas, of Add MS 356371
- O'Brien, Rear Adm. Donat Henchy1
- O'Carroll, William1
- O'Ferrall, Captain1
- O'Kelly, Johann Jakob, Count1
- O'Shanly, J-, Lieutenant1
- Obreskow, Alexis Mikhaïlovitch, Russian Envoy to the Ottoman Porte1
- Ogilvie, William, Surgeon1
- Ogle, John, of Add MS 358321
- Ompteda, Dietrich Heinrich Ludwig von?, Hanoverian minister at the Diet of the Empire1
- Orsini, Vincenz Ferrerius Andreas, Count Rosenberg1
- Osborn, George, 4th Baronet1
- Osbourne, Peter1
- Oswin, Richard, Reverend; of Wisbeach1
- Ousnam, William, Purser., RN1
- Overbury, Thomas, of Add MS 347381
- Paar, Johann Wenzel, Prince1
- Pagave, Venanzio, of Milan1